Twin suicide bombings killed 48 people Sunday, including dozens from a government-backed, anti-Al-Qaeda militia who were lined up to get their paychecks near a military base southwest of Baghdad, Iraqi officials said. The bombings were the deadliest in a series of attacks across Iraq Sunday that were aimed at the Sons of Iraq, a Sunni group also known as Sahwa that works with government forces to fight Al-Qaeda in Iraq. The attacks highlighted the stiff challenges the country faces as the US scales back its forces in Iraq, leaving their Iraqi counterparts in charge of security. The first attack Sunday morning – the deadliest against Iraq's security forces in months – killed at least 45 people and wounded more than 40. It occurred at a checkpoint near a military base where Sahwa members were lined up to receive paychecks in the mostly Sunni district of Radwaniya southwest of Baghdad. “There were more than 150 people sitting on the ground when the explosion took place. I ran, thinking that I was a dead man,” said Uday Khamis, 24, who was sitting outside the Mahmoudiyah hospital where many of the wounded were taken. His left hand was bandaged and his clothes were stained with blood. “There were more dead people than wounded,” he added. In the second attack, a suspected militant stormed a local Sahwa headquarters in the Anbar province town of Qaim, near the Syrian border, and opened fire on those inside. Sahwa fighters returned fire, wounding the attacker, who then blew himself up as they gathered around him, killing three of the fighters and wounding six others, two police officials said, also speaking on condition of anonymity. Qaim is a former insurgent stronghold. The Sahwa fighters have played a key role in the reduction of violence in Iraq since they first rose up against their former Al-Qaeda allies in late 2006, joining the US military and government forces in the fight against the terror group.