POLITICO first reported in April that the Navy was issuing new guidelines for personnel to report sightings of unidentified projectiles. | Stan Honda/AFP/Getty Images defense Republican lawmaker presses Navy on UFO sightings

A top Republican on the House Homeland Security Committee is seeking more details from the Navy on recent reports of "unidentified aerial phenomenon," including what resources it is using to investigate the mysterious sightings and whether it has "found physical evidence or otherwise" to substantiate them.

"Based on pilot accounts, encounters with these UAPs often involved complex flight patterns and advanced maneuvering, which demand extreme advances in quantum mechanics, nuclear science, electromagnetics, and thermodynamics," Rep. Mark Walker of North Carolina, the ranking member of the Intelligence and Counterterrorism Subcommittee, wrote to Navy Secretary Richard Spencer in a newly released letter dated mid-July.


"If the accounts are true," Walker added, "the unidentified crafts could pose a serious security risk to our military personnel and defense apparatus."

POLITICO first reported in April that the Navy was issuing guidelines for personnel to report the sightings.

"While I am encouraged by the Navy's proactive decision to draft new guidelines for reporting, I am concerned these reports are not being fully investigated or understood," Walker told Spencer.

Walker is also asking whether the Navy is aware of any foreign nations or private companies "who have made significant advances in aero physics."

