BEIJING, Dec. 26 -- Twenty suspects were detained by police for violent behavior in a case in which dozens of people in four cars chased a jeep and beat up its occupants in Xi’an in central China’s Shaanxi Province.

One person was killed earlier and four others were seriously injured which followed a dispute over a local contract.

Police also seized a shotgun, 31 shotgun bullets, 35 small-bore gun bullets, six cars and knives, rods and bricks.