The US military says American and Iraqi troops have repelled a series of coordinated attacks in Baghdad, killing six insurgents. Officials said Saturday that US attack helicopters responded to the assault, which included suicide car bombs, one of which killed an Iraqi soldier. Twelve insurgents were captured in the fighting. Also in Baghdad, US. troops captured another seven insurgent suspects and seized a car bomb being prepared for an attack. Coalition officials say many of the powerful bombs used recently came from Iran. A senior coalition official told VOA's Baghdad correspondent (Saturday) insurgents are using sophisticated explosive devices (called "shaped charges") smuggled into the country from Iran. However, the official said there is no evidence to suggest that the Tehran government is facilitating the smuggling into Iraq.