Yakima, WA - This morning police arrested an 18 year old woman in for assault. According to police, she beat up a 21 year old woman with brass knuckles that had spikes on them. The incident took place around 11 o'clock last night on the 1200 block of west Lincoln Avenue. The victim had cuts all over her hands and arms. Police say the attacker drove off in a maroon Pontiac, which they later spotted at the All-Star motel. They found the suspect inside and arrested her. She was taken to the Yakima County Jail, where she is being held on second degree assault charges.