US officials are sending a drone detection system to New York, Governor Kathy Hochul says, after questions over mysterious objects in the skies over the east coast and beyond grew in recent days. Hochul requested the federal assistance after drone sightings forced runways at Stewart International Airport in the state to shut for an hour last week.

Officials sound alarm over reports of the strange sights—seen over New Jersey, New York, Maryland and Pennsylvania—with one asking for a “limited state of emergency.”