A Yemeni security official said a bombing at a military checkpoint in central Yemen has killed three soldiers and injured four, AP reported. The official, speaking on condition of anonymity because he is not authorized to talk to the media, said the bomb exploded when the soldier's car arrived early Wednesday at the checkpoint in Marib province, 176 kilometers (109 miles) east of the capital San'a. He added that preliminary police reports indicated that the bomb was detonated by a remote control.