More mysterious drone sightings have been reported in Northeast, in a strange surge after the Federal Aviation Administration lifted temporary flight restrictions following thousands of reported drone sightings late last year.

The mysterious drones that sparked a frenzy in the Northeast seem to have returned after the FAA’s temporary restrictions in parts of New Jersey and New York expired. NBC’s Sam Brock reports for TODAY.

The FAA imposed temporary flight restrictions from December to Jan. 19, when drone sightings began to once again increase from Connecticut to New Jersey, according to NBC. NBC reported that U.S. Sen. Chuck Schumer confirmed the return of the drones on Sunday, saying, “We have now seen new drone sightings. We’re going to have to look into it.”