Updated

CHICAGO -- An off-duty Chicago police officer dressed as a clown for a fundraiser shot and killed a teen who authorities say was trying to rob him.

Police say the officer was headed home from a children's event Friday night when the suspect approached him, asking for money.

When the officer said he didn't have any, police say the teen pulled a gun.

After a struggle, the officer grabbed the gun and fired, killing the teen.

The officer sustained minor injuries. A weapon has been recovered.

Authorities haven't released the names of those involved.

The Independent Police Review Authority is investigating the incident.