• Dozens of unidentified aircraft have been spotted over military bases, airports, and cities in the US.
• The Pentagon said Monday that DoD has "no evidence" the drone sightings pose a threat.
• A White House spokesperson said the sightings include a mix of commercial, hobbyist, and law enforcement drones.

US officials said on Monday that the mystery drones flying over US military bases, airports, and cities don't pose a threat.

On Monday, White House national security spokesperson John Kirby said that more than 5,000 drone sightings have been reported in recent weeks, but only about 100 required further investigation.

He said the sightings have included a combination of lawful commercial drones, hobbyist drones, and law enforcement drones, as well as some crewed aircraft and stars mistaken for drones.

The House Intelligence Committee was expected to receive a classified briefing on Tuesday over the issue, a source familiar with the matter told CNN.

The drones have been seen flying at night over New Jersey and other East Coast states since mid-November, sparking concern and speculation from officials and citizens.

Kirby told reporters that "our assessment at this stage is that the activity is lawful and legal,"

The federal government has sent advanced technology and additional personnel to assist local authorities and state officials investigating the sightings, Kirby said.

He stressed that the government does not believe the drones represent a threat to national security.

"There are more than one million drones lawfully registered with the FAA here in the US and there are thousands of commercial hobbyists and law enforcement drones that are lawfully in the sky on any given day," Kirby said.

Kirby spoke to reporters on Monday after the Pentagon indicated, drawing an analogy to vehicles that approach the base, it wouldn't shoot at something unless it presented as a "clear and present danger."

The Department of Homeland Security echoed Kirby's statement in a post to X late on Monday.

Pentagon spokesperson Maj. Gen. Pat Ryder said the Defense Department has "no evidence at this time that the reported drone sightings pose a national security or public safety threat, or have a foreign nexus."

"We'll continue to do everything possible to investigate reports of concerning activity," he told reporters Monday. "But given how many drones are lawfully in our skies every day, we need to be careful to avoid assuming malintent or malicious behavior."

President-elect Donald Trump accused the US government on Monday of withholding information about the drones.

"The government knows what is happening," he said during public remarks at Mar-a-Lago. "And for some reason, they don't want to comment. I think they'd be better off saying what it is. Our military knows, and our president knows, and for some reason, they want to keep people in suspense."

"Something strange is going on," Trump said of the recent developments. "For some reason, they don't want to tell the people."

Mayors of 21 towns in New Jersey sent a letter Monday to the state's governor, Phil Murphy, demanding more transparency.

"Despite inquiries made to relevant authorities, we have yet to receive satisfactory answers about the purpose, operators, or safety protocols governing these flights," the letter says.

Where have residents reported seeing drones and unidentified aircraft?

Residents and officials have reported spotting unidentified aircraft, believed to be drones, flying above New Jersey, New York, Connecticut, Maryland, Massachusetts, Pennsylvania, and Ohio in recent weeks.

Murphy, the New Jersey governor, said late Monday that he had received a briefing from FBI Newark on their investigation.

"We are ready to assist the federal government in getting to the bottom of this," he added.

Murphy told reporters on Monday that some of the suspected drones spotted over his state are "very sophisticated" and can "go dark" the "minute you get eyes on them." Others have described the flying objects as bigger than normal hobby-style drones and able to avoid detection.

"This is something we're taking deadly seriously and we've gotten good cooperation out of the feds, but we need more," Murphy said.

Drones have been spotted near Picatinny Arsenal and Naval Weapons Station Earle, both military bases in New Jersey, and an airport in New York serving the public and the military.

However, officials have stressed such sightings are not necessarily unusual.

"This is not a new issue for us. We've had to deal with drone incursions over our bases for quite a time now," the spokesperson for the Joint Staff said Saturday. "It's something that we routinely respond to in each and every case when reporting is cited."

There have also been reports of suspected drones following a US Coast Guard vessel, as well as local police statements on the presence of unidentified aircraft near critical infrastructure.

US Northern Command, which is responsible for overseeing the protection of the US homeland, said over the weekend it was "aware and monitoring the reports of unauthorized drone flights in the vicinity of military installations in New Jersey."

Wright-Patterson Air Force Base in Ohio acknowledged that drone activity near the base led officials there to close its airspace for several hours late Friday night and into Saturday.

A recording of a controller from the Wright-Patterson air traffic control tower that was shared by The War Zone, which first reported the incursions, urges an aircraft to "use extreme caution for heavy UAS movement on the base."

What are officials saying about these mystery drones?

Trump said Friday on Truth Social that there are mystery drones being sighted all over the country. "Can this really be happening without our government's knowledge," he wrote. "I don't think so!"

He suggested that they be shot down. Other officials have expressed concern about shooting them down due to the threat to local populations of falling debris. Neither kinetic nor electronic warfare methods are particularly ideal near civilian areas.

New Jersey State Assemblyman Brian Bergen told CNN News Central's Sara Sidner on Monday that "we shouldn't be shooting things down right now."

"Look, I was an attack helicopter pilot in the US Army. I flew overseas. I have seen bullets fly through the sky. It's not a great idea to do over the United States," he said. "Things should not be shot out of the sky. That is a very dangerous thing to do."

The FBI and New Jersey State Police issued a joint statement on Monday warning of "a concern with people possibly firing weapons at what they believe to be a UAS," as well as increased incidences of pilots being dazzled by lasers.

There could be "deadly consequences" of these actions, they said.

Amid the confusion on the drones, there has been a lot of speculation, including from officials.

Rep. Jeff Van Drew of New Jersey said on Fox News last Wednesday that the drones came from an Iranian "mothership" off the East Coast of the United States, citing "very high sources."

Pentagon Press Secretary Sabrina Singh rejected the congressman's claim in a press conference later that day, saying "there is no Iranian ship off the coast of the United States, and there's no so-called mothership launching drones toward the United States."

Singh said that the Pentagon has no evidence that the reported drone sightings are the work of a foreign adversary. While Iran does have vessels that can carry drones, they were spotted off its southern coast as recently as Thursday — debunking Van Drew's claims.

He doubled down on Thursday, saying the government isn't telling the truth. The congressman said it could be another ship belonging to another foe. A Department of Homeland Security official said Saturday that there is no evidence of any foreign-based involvement in sending drones ashore from vessels in the area.

"We're doing our best to find the origin of those drone activities," an FBI official told reporters Saturday. "But I think there has been a slight overreaction."

Local officials, meanwhile, have been calling for additional information.

New York Gov. Kathy Hochul on Saturday called for increased federal oversight of drones and said runways at Stewart International Airport in Orange County were shut down for an hour due to unidentified drone activity. "This has gone too far," she said.

Hochul called on Congress to strengthen the Federal Aviation Administration's oversight of drones and provide counter-unmanned aircraft equipment to local law enforcement. On Sunday, she posted to social media that the federal government was sending a "drone detection system" to her state.

Previous unidentified flying objects and drone sightings

There have been a number of sightings of suspected drones and other unusual flying objects over or around military installations in recent years.

In February 2023, for example, the United States shot down three unidentified objects flying over American airspace over the course of three days. The incidents were part of a saga that followed the US takedown of a spy balloon off the coast of North Carolina the government said came from China.

As for drone activity, The Wall Street Journal reported in October that drones had been spotted over a military base in Virginia and the Energy Department's Nevada National Security Site the year prior. Retired US Air Force Gen. Mark Kelly, until March of this year the head of Air Combat Command, said that he learned about the sightings in December 2023, when officials at Langley Air Force Base in Virginia reported seeing dozens of drones flying over the base at night. It's unclear who was behind those incidents.

While the federal government says that the latest sightings are not the work of adversaries or a public security threat, multiple recent incidents near bases have raised national security concerns.

For instance, federal authorities on Monday charged a Chinese citizen residing in California, Yinpiao Zhou, with failure to register a non-transportation aircraft and violation of national defense airspace. The Justice Department accused Zhou of using a drone to photograph Vandenberg Space Force Base in Santa Barbara County on November 30.

Police arrested Zhou at the San Francisco International Airport before he boarded a China-bound flight.

And another man, Fengyun Shi, a Chinese national, was sentenced to six months in federal prison in October for photographing US Navy ships with a drone in Virginia. Fengyun, a student at the University of Minnesota, pleaded guilty to two misdemeanor counts of unauthorized use of aircraft for the unlawful photographing of a designated installation.

The FBI official who spoke to reporters on Saturday said of the most recent sightings: "We are doing everything we can, alongside our partners, to understand what is happening and whether or not there is more nefarious activity that we need to explore."