Police are searching for a man who they say has been making lewd gestures toward passengers on Bronx subway trains.

According to cops, the suspect first simulated a sex act in front of one victim on May 8 while on the 2 train and then again while aboard the 5 train on May 16. They say both incidents happened in the middle of the afternoon.

The man is believed to be in his 60s or 70s and about 5 feet 8 inches tall, with a gray and white mustache.

Anyone with information should call Crime Stoppers at 1-800-577-TIPS.