DALLAS -- A 25-year-old man has been arrested by Dallas police, accused of multiple sex crimes against children.

Timothy Woolman was arrested on Friday. He faces a charge of sexually assaulting a child, who was two years old at the time, online solicitation of a minor, also involving a 2-year-old, and possession and promotion of child pornography, in which the child was three years old.

An investigation into Woolman began when a 15-year-old girl called police to tell them she met Woolman through an online teen chat line. She said the suspect asked her to meet him and then sexually assaulted her.

Woolman's bond has been set at $300,000.