CHICAGO (CBS) — Chicago and federal law enforcement will collaborate to reduce the number illegal guns in the city.

President Trump tweeted Friday: “Crime and killings in Chicago have reached such epidemic proportions that I am sending in Federal help.”

Chicago police and the Bureau of Alcohol, Tobacco, Firearms and Explosives are forming a Chicago Crime Gun Strike Force.

Chicago Mayor Rahm Emanuel confirms 20 ATF agents already are in Chicago.

“Six months ago we made it clear that we would welcome additional federal support, and six months later we appreciate the 20 new ATF agents that are now arriving,” said Mayor Emanuel’s spokesman Adam Collins. “But the progress CPD has made this year has happened without any of the new resources from the federal government we requested.”

Chicago police Superintendent Eddie Johnson said in a statement “we are foundationally changing the way we fight crime in Chicago.”

State police, intelligence analysts and state and federal prosecutors will target illegal guns and repeat gun offenders.

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