A special agent of the state Attorney General was shot late Friday while following two cars believed to be involved in drug trafficking, Peoria police said.

The undercover agent was shot in the shoulder and neck around 4:15 p.m. by one of the suspects he was following in the area of 91st Avenue and Mountain View Road in Peoria, said Capt. Steve Harrison with the Department of Public Safety.

When the suspects realized they were being followed, they began driving aggressively, Harrison said. The driver of a white pickup of truck circled back behind the officer and began ramming the agent's car.

The second car, a gold Chrysler Pacifica, remained in front of the agent. The truck then pulled parallel with agent's car and someone in the truck shot the agent, Lt. Stephen Hadley with Peoria police said. It is not clear how many people were in the truck, he said.

The agent was treated and released from the hospital, said Amy Rezzonico, an AG's spokeswoman.

Harrison said the agent is part of a multi-agency drug task force and that other officers in the area were monitoring him and responded when he was shot. Peoria police and DPS officers responded to the scene.

The driver of the white truck was arrested Friday, and police were still looking for the occupants of the Pacifica on Monday.

Harrison said Friday that the suspects were part of a Mexican drug cartel. On Monday, Lt. Stephen Hadley with Peoria police said officers were unable to connect the shooting to a cartel.

Peoria police are investigating the shooting.