Kenosha police arrested nine people traveling in vehicles with out-of-state license plates Wednesday on suspicion of criminal conduct amid the civil unrest occurring in the city.

Officials said they received a tip about the vehicles. When officers found them -- a bread truck, black school bus and minivan -- they followed the occupants, a police news release said.

The department did not specify which states the license plates were from. While under police surveillance, the group stopped at a gas station and attempted to fill up multiple fuel cans, the statement said.