Yemen military announced Friday that most of the attackers, who stormed a Yemeni Defense Ministry complex on Thursday, were Saudi nationals

Yemen military announced Friday that most of the attackers, who stormed a Yemeni Defense Ministry complex on Thursday, were Saudi nationals.

The military's chief of the general staff said in a preliminary report submitted to Yemeni President Abd Rabbuh Mansur Hadi that there were about 12 attackers participating in the assault that killed 56 people in the center of the capital Sana’a.

According to the report, the 12, who were all killed, were wearing army uniforms and opened fire at soldiers guarding one of the hospitals inside the military complex.

"The terrorists were estimated at 12 and most of them were Saudi nationals. The (investigation) committee is still working on acquiring more information about the terrorists and their goals," the report said.

According to the latest figures released by the Yemeni government, 215 people were also injured and that there were medics from Germany, Vietnam, India, and the Philippines among the dead.

Meanwhile, a militant group affiliated to al-Qaeda claimed responsibility for the attack.