FORT COLLINS, Colo. -- A high-speed chase through Fort Collins ended Wednesday morning with two car crashes -- one involving a suspected drunken driver and the other involving a Colorado State Patrol trooper.

Authorities say it began at about 12:47 a.m. when an agent with Immigration Customs and Enforcement approached a man whom he spotted allegedly driving the wrong way on a one-way street in downtown Fort Collins.

The agent pulled the Toyota Camry over to the side, but the driver allegedly sped off, running over the agent's foot, authorities said. The ICE agent jumped into his vehicle and followed the suspect, later identified as Anthony Standard, 23.

The Colorado State Patrol joined the pursuit when the chase went by them at Laurel and Matthews streets in Fort Collins, the CSP said.

But four minutes into the pursuit, with the suspect allegedly going over 100 mph, authorities lost sight of him.

Using his license plate number, authorities traced him to an apartment and waited for him there. A few minutes later, a trooper spotted him driving toward his house but he saw the trooper's vehicle and fled, and the pursuit picked up again, the CSP said.

The chase ended when the suspect's vehicle crashed through a guardrail near Mulberry Street and Timberline Road, flew into a ditch and rolled again, landing on its roof on an embankment.

Standard was extricated and taken to the Poudre Valley Hospital, where he remains in serious condition.

A trooper's cruiser also crashed into a guardrail near that location but it didn't go into the ditch. The trooper suffered minor injuries and was treated and released.

The incident is still under investigation. Authorities believe that the driver was under the influence of alcohol.

Four agencies, including the Larimer County Sheriff's Office and Fort Collins police, were also involved in the pursuit.