Three rockets hit on Friday in the vicinity of Baghdad airport near a military base that hosts US forces, the Iraqi military said in a statement. The incident caused no casualties, the statement said. A number of rocket and mortar attacks have hit bases hosting coalition forces and landed near the US embassy in Baghdad in recent months. The United States blames Iran-backed militia groups. Iraq’s Security Media Cell announced on Thursday three Katyusha rockets had fallen into Iraq’s Balad air base, 80 km (50 miles) north of Baghdad, which houses US forces but caused no casualties or losses.