Austin police asked for help Friday finding four men involved in an aggravated sexual assault.

Police said it happened Thursday morning near Cameron Road and U.S. 290.

A woman said she was driving when four men pulled up next to her and showed a gun.

She said they made her pull over in a residential area and one of the men made her open her door.

Police said the man stole things from inside her vehicle - and then physically and sexually assaulted her.

The woman said he stopped and left when she screamed.

The men were driving a brown two-door vehicle.

Police also said the woman hit a blue vehicle when she fled -- but did not exchange information with the other driver.

The driver of that vehicle was described as a blonde woman with waist length blonde hair.

Anyone with information about the assault or collision is asked to call 974-5095.