At least four people have been killed in a suicide car bomb attack outside Iraq\'s interior ministry. At least 17 people were also injured in the attack, which officials say happened at about 04:30 GMT. On Thursday, a series of bombings killed nearly 70 people in the capital. The attacks follow the withdrawal of the last US combat troops from the country after nearly nine years of military engagement. The attacker rammed his explosive-laden car through the main gate when interior ministry officials opened it to allow maintenance workers in, a ministry official was quoted as saying by the AFP news agency. Ambulances could be heard rushing to the scene of the attack, as helicopters flew overhead. There are fears that the death toll could rise further.