Clashes between security forces and gunmen killed six people and wounded 28 in Baghdad overnight, Iraqi police said on Wednesday. Police said gunmen fought U.S. and Iraqi forces in the east Baghdad. Five people were killed and 22 wounded overnight, police said, without giving details on the casualties. Fighting also erupted in western Baghdad's Shula district, Reuters reported. On Wednesday, heavy automatic weapon fire echoed through the streets of Shula as U.S. Apache attack helicopters hovered overhead. Shops were closed and residents stayed home. Police said one person had been killed and six wounded in the Shula fighting, which began on Tuesday. A spokesman for U.S. forces in Baghdad, Lieutenant-Colonel Steven Stover, earlier said Tuesday had been quieter in Sadr City compared to previous days.