Police warn people to be on the lookout for a man in a van who exposed himself to two children Monday evening in Sharon.

Police said a 7-year-old boy and 9-year-old girl were in the 500 block of Baldwin Avenue about 5:45 p.m. when a van circled the block slowly four times and the driver exposed his genitals.The children ran home and told their mother, who called police.

The van may have been a Chevrolet Astrovan and was described as tan or cream-colored with a lighter stripe on the sides, a dark luggage rack on top and tinted windows, police said. The driver was a white man in his 40s with yellow-blond hair wearing a black shirt, police said.

Anyone with information is asked to call police and anyone who sees a van matching the description should try to get a license plate number and notify police.