In the last few months there have been several “push-in” robberies, in which a robber rings someone’s doorbell and when the door is answered, pushes their way in with a gun and grabs the resident’s cash and jewelry. Most of the robberies have been in Bushwick, but some took place in Ridgewood, Williamsburg, and East New York. Some advice: if you don’t know the person ringing your doorbell, do not answer it. Visitors should have your phone number anyhow.