Updated

Two Illinois men are facing federal charges in connection with a shootout that left a federal agent critically wounded during an Indiana undercover operation.

Prosecutors filed charges Friday. Investigators are still searching for 25-year-old Bernard Graham of Calumet City, who's considered armed and dangerous, and they're offering $25,000 for information leading to his arrest.

Investigators say three men ambushed federal agents on Thursday during an illegal weapons investigation in Gary, Indiana, just southeast of Chicago.

Graham and 19-year-old Blake King of Chicago are charged with assaulting a federal agent. They're also facing a federal firearms charge. A third suspect was fatally shot.

Investigators say the suspects fired their weapons at agents with the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives. A Chicago-based ATF agent was shot and critically wounded.

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Information from: The Times, http://www.nwitimes.com