A New Jersey state senator is calling for a limited state of emergency over the mysterious drones that have been flying over New Jersey in recent weeks.

“The state of New Jersey should issue a limited state of emergency and ban all drones until the public receives an explanation regarding these multiple sightings,” Republican Senator Jon Bramnick said in a statement on Tuesday.

The call came amid numerous drone sightings reported across New Jersey in recent weeks. Officials and witnesses said the drones were larger than the type typically used by hobbyists.

The source and reason for the drones remain unknown as local, state and federal investigators investigate the matter.

New Jersey’s Picatinny Arsenal – a military research and production facility in Morris County – has reported 11 confirmed sightings by a police or security officer since November 13 in response to a report.

“While the source and cause of these aircraft operating in our area remains unknown, we can confirm that they are not the result of Picatinny Arsenal-related activities,” said the Picatinny Arsenal garrison commander. Lt. Col. Craig Bonham II said in a statement Tuesday.

An FBI spokesman said the agency was “doing everything we can to find out what’s going on.” “The public can still call our 800 number or submit a tip online. We respond to every material tip we receive,” the spokesperson said.

Law enforcement agencies’ power to actually crack down on such drone activity is limited and their authority is more reactive than proactive, a senior U.S. official told ABC News.

The mayors of 21 New Jersey cities have written a letter to Governor Phil Murphy demanding action against the mysterious drones.

Michael Melham, the mayor of Belleville, New Jersey, posted on Facebook Monday evening that a briefing exclusively for New Jersey mayors with the New Jersey State Police and the New Jersey Office of Homeland Security and Preparedness about the drones will be held on Wednesday.

The drones have raised concerns due to their proximity to a military installation and President-elect Donald Trump’s Bedminster golf course.

ABC News’ Alex Faul and Julia Reinstein contributed to this report.