Palo Alto sexual assault suspect arrested

Police are looking for Tyler Wallace, 28, who allegedly sexually assaulted his girlfriend early Sunday morning in Palo Alto. Police are looking for Tyler Wallace, 28, who allegedly sexually assaulted his girlfriend early Sunday morning in Palo Alto. Photo: Palo Alto Police Department Photo: Palo Alto Police Department Image 1 of / 1 Caption Close Palo Alto sexual assault suspect arrested 1 / 1 Back to Gallery

Palo Alto police have arrested a man suspected of sexually assaulting his live-in girlfriend Sunday morning, police said.

Knife in hand, Tyler Wallace, 28, attacked his girlfriend at her home on the 2800 block of Alma Street around 3:20 a.m., police said.

Officers swarmed to the home after someone called 911, but police said Wallace had already fled on foot out the back door of the home. The victim did not require medical treatment at the scene.

Authorities surrounded the neighborhood and searched the area with the help of a police dog, but by 6 a.m., officers determined Wallace was no longer in the area. He was arrested Sunday evening.

Police found a knife during the search but could not confirm if it was used in the attack.

Evan Sernoffsky is a San Francisco Chronicle staff writer. E-mail: esernoffsky@sfchronicle.com Twitter@EvanSernoffsky