4 critical after thwarted robbery

March 15, 2012 1:28:03 PM PDT
Three masked men and a store clerk were wounded in a shootout during a robbery on Chicago's West Side.

Officers opened fire outside a beauty supply store Wednesday night in the 5100 block of W. Lake Street.

Police officers confronted three armed men who began firing shots and officers returned fire wounding the suspects.

A clerk was also hit, but no officers were injured.

The incident is being studied by the Independent Police Review Authority, which investigates all police- related shootings.