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Two senior Iraqi generals are being questioned in last week's attack in Karbala, in which 5 U.S. soldiers were killed, the Pentagon told FOX News.

Because of the sophistication of the attack — where militants poses as U.S. soldiers attacked a meeting of U.S. and Iraqi soldiers — Iran was suspected of being involved, Pentagon officials said.

The assault was conducted by nine to 12 militants posing as an American security team. They traveled in black GMC Suburban vehicles — the type used by U.S. government convoys — had American weapons, wore new U.S. military combat fatigues and spoke English.

The raid, as explained by Iraqi and American officials, began after nightfall at about 6 p.m. on Jan. 20, while American military officers were meeting with their Iraqi counterparts on the main floor of the Provisional Joint Coordination Center (PJCC) in Karbala.

The Pentagon said the investigation into the attack is ongoing and several Iraqis have been detained for questioning.

Because high-level generals were possibly involved, the Pentagon said, it raises questions about the loyalty and trustworthiness of Iraqi military officers at the highest levels.

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