Oklahoma City police are calling in hazardous materials crews, in connection with an alleged murder for hire plot.

Thrity-year-old Preston Rhoads was arrested near his northwest Oklahoma City home, Thursday afternoon.

Police Sergeant Gary Knight said Rhoads sat in two different police cars during his arrest. Knight said today, police received a tip both patrol cars might be contaminated with a dangerous substance.

Knight isn't saying what kinds of agent might be involved, but he said the officers were alerted and hazardous materials crews were notified.

Kight said no injuries have been reported.