Al-Qaeda in the Arabian Peninsula (AQAP), regarded by Washington as the jihadist network's most dangerous affiliate, has been hit by intensified US drone strikes targeting its militants in Yemen this year.
But there was no immediate evidence to support its allegation that the Sanaa complex attacked yesterday played any role in the drone war or housed any US personnel.
Two doctors from Germany, two from Vietnam and another from Yemen were killed, as well two female nurses from the Philippines and one from India, Yemen's official Saba news agency said.
The complex in central Sanaa was "stormed... After the mujahedeen (holy warriors) proved that it accommodates drone control rooms and American experts," AQAP said in a statement published by its media arm on Twitter.
"As part of a policy to target drone control rooms, the mujahedeen have dealt a heavy blow to one," it said.
"Such security headquarters in partnership with the Americans in their war on these Muslim people are a justified target wherever they may be."
Deputy State Department spokeswoman Marie Harf said she had no information about any US casualties.
But the Philippine foreign ministry gave a higher death toll for its nationals, saying that seven had died, all medical staff and including a doctor.
The remaining "martyrs" were all patients in the hospital, including both soldiers and civilians, among them a top Yemeni judge and his wife, Yemen's supreme security committee said.
Saba said 167 people were wounded, nine of them seriously.
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