Howard County police are offering a $1,000 reward for information about a suspect they say committed a sexual assault Sunday on a 12-year-old girl in Elkridge.

The girl told police that an unknown man approached her and two friends at about 2 p.m. at a shopping center in the 6500 block of Waterloo Road in Elkridge. The man struck up a conversation with the girls and told them he was selling magazines, police said.