UPDATE - Chicago African Americans Honor Trayvon Martin with 4 MURDERED & 9 SHOT and WOUNDED yesterday

Chicago Police secure the scene of a shooting near 131st and Langley Ave. in Chicago on July 21. (Terrence Antonio James/Tribune photo)

Shootings left at least four men dead and 9 other people wounded across the Saturday night and Sunday morning.

• Photos: Chicago overnight crime scenes

• Map: Track homicides in Chicago

• Interactive map of Chicago shootings