More than 30 people were killed and scores of homes set alight in clashes in the past week between nomadic herdsmen and farmers in the central Nigerian state of Nasarawa, police said on Tuesday. Police said the latest clash erupted on Sunday when herdsmen attacked villages to avenge the killing on Dec. 6 of a Fulani nomad by farmers who said his cattle had destroyed crops. "Over 100 mostly mud houses have been burned and over 30 people on both sides, including one policeman, are believed to have been killed," Nasarawa state police commissioner Shehu Babalola told Reuters.