For weeks, New Jersey residents have spotted mysterious drones in the night sky throughout the state. Some New Yorkers and Pennsylvanians have seen them, too. These sightings have confounded local and federal authorities, who have been unable to determine the drones’ origins or their purpose. Here’s what we know about the ongoing mystery.

The city’s emergency-management agency acknowledged new reports of drone sightings at La Guardia Airport but stated that the accounts are unconfirmed.