An investigation is underway after a 37-year-old woman was sexually assaulted on the Southwest Side Friday evening by a male, a San Antonio preliminary report said.

Police responded to a call after 10 p.m. in the 3900 block of Pecan Valley Drive, located between Southside Lions Park, and found a woman who said she was sexually assaulted.

The report described the woman walking to a nearby location when a male driver approached her.