Police are looking for a man on a bike who shouted abuse and made rude gestures at two girls in Gosberton on Saturday.
It happened at about 5.15pm when the man rode past the girls who were walking in the village.
He is described as white, in his late 40s to early 50s, medium build, scruffy appearance and long spiked hair.
He was wearing a red chequered shirt, blue shorts and riding a dark coloured bicycle.
If you can help, call 101 and state incident 470 of April 5.