A deadly day in Baghdad.<br/> <br />Four bombs go off in the Iraqi capital, killing at least 13 people.<br/> <br />As smoke billowed from one of the sites, firefighters sifted through the wreckage after dousing the flames.<br/> <br />The attacks took place near the heavily fortified "Green Zone," home to the prime minister's office and Western embassies.<br/> <br />Two parked car bombs were detonated near the Ministry of Foreign Affairs, putting security there on high alert.<br/> <br />No group immediately claimed responsibility for the attacks, but Sunni Islamist militants have been regaining ground in the country.