Mysterious drone sightings in New Jersey raise questions about regulations. Here are 5 things to know

Recently, sightings of what appear to be drones flying over New Jersey at night have created anxiety among some residents.

Drones for commercial and recreational use have grown rapidly in popularity, despite restrictions on who can operate them and where they can be flown.

No-fly zones are enforced around airports, military installations, nuclear plants, certain landmarks including the Statue of Liberty, and sports stadiums during games.

Not everybody follows the rules. Sightings...