At least 12 people were killed in Kenya's arid north when police fought cattle rustlers believed to have crossed the border from Ethiopia, a police official said on Saturday. "The raiders were pursued to recover the stolen livestock. Ten of them were killed," said the police official, who declined to be named. "The number could rise because some of them were injured with gunshot wounds," he was quoted as saying by Reuters. He added that two herders had also been killed in the clashes a few hundred kms from the northern town of Marsabit.