Gov. Phil Murphy (D-NJ) called for the federal government to pull more resources into investigating the thousands of baffling unmanned aircraft systems spotted in New Jersey and New York since Nov. 18.

Lawmakers have expressed increasing concern that the mysterious objects, often described as resembling small-car-sized drones, could pose a national security threat. As the FBI, Department of Homeland Security, and an array of local and state law enforcement scrutinize the bizarre activity, Murphy indicated the federal government isn’t doing enough to alleviate constituents’ concerns in a letter to President Joe Biden on Thursday.