American troops fired on vehicles trying to drive through roadblocks in Baghdad and north of the Iraqi capital, killing at least five people - including a child - in two separate shootings, the US military said Tuesday. The shooting in Baghdad took place in a northern neighborhood known to be a Shi'ite militia stronghold as the driver collected employees of the Rasheed bank, police said. US troops fired warning shots when the bus reached the US roadblock Tuesday morning and tried to drive through, killing as many as four passengers - including three women, police and hospital officials said. "As I understand it, some of the warning fire ricocheted and may have killed two to three individuals," said Rear Adm. Gregory Smith, a US military spokesman. Smith said the driver was traveling in a lane restricted to passenger cars. In an earlier statement, the US military said two people were killed in the shooting and four wounded. A manager at Rasheed bank also said the shooting claimed two lives.