Portland, OR (KPTV-CNN) — A Portland Timbers fan who held up his Timbers scarf and yelled at a group of San Jose fans suddenly found himself a victim of a mob attack Sunday. James Decker, from Lake Oswego, was stopped at a red light in his 2007 Saab at Burnside and Sixth Avenue two hours before kickoff time. While on his way to JELD-WEN Field, Decker saw a large group of San Jose Earthquakes fans walking toward the stadium. After showing them his scarf and yelling at the group, a woman ran over to his car and hit him in the face as she tried to grab his scarf, Decker told police. Decker said he started to drive away, but the woman fell on the ground, so he said he stopped to make sure she was OK. A group of 10 to 12 men then ran over to his car, jumped on the hood and smashed the windshield, Decker said, and one man punched him through the open car window. Someone else opened the passenger side door of his car and punched him from the other side, Decker told police. Decker did not suffer any significant injuries in the attack. Several witnesses who stopped to help confirmed Decker's account of what happened, according to police. Officers first learned of the attack around 5:30 p.m. when they received a report of "about 70 to 100 people jumping on cars, throwing bottles and being rowdy." Once police arrived, they found Decker's windshield partially caved in and he told them what happened. Police said they're hoping to contact the woman who first ran over to Decker's car. She's described as Hispanic, in her 20s and 5'6" tall with a heavy build. She wore a blue Earthquakes sweatshirt and dark pants. Most of the other attackers wore scarves over their faces. Police said they looked for the woman with Decker, but they weren't able to find her. Now they're hoping a witness may have video or photos of the incident.