Sanaa, Mar 31: An airstrike killed four al-Qaida militants on Friday in a southern district of Yemen that has been under the group's control for around a year, officials said.
They said a gas pipeline in the same region was attacked later in the day in an operation likely carried out by militants.
The military officials from Shabwa province said that an unmanned US drone launched the strike on a vehicle carrying seven militants in the district of Azan. The officials said four were killed, while three were critically wounded and under treatment in a nearby al-Qaida-run clinic in Shabwa.
A security official said the attack may have killed leading figures in the group, who were attending Friday prayers and left together. He had no further details.
A second airstrike on Friday, just a few kilometers from the first strike, hit a building believed to be used by al-Qaida near a main market in the town of Azan. Four residents were wounded, said medical officials.
There was no immediate comment from US officials, but Washington has carried out deadly airstrikes in Yemen in the past. Last year, a US drone strike killed US-born militant cleric Anwar al-Awlaki and a second American, Samir Khan, who edited al-Qaida's Internet magazine.
Last month, al-Qaida-linked militants publicly executed a Yemeni in Azan who they suspected of collaborating with the United States by planting electronic devices that help US drones strike militant positions.
Al-Qaida in the Arabian Peninsula, as the branch is known, was believed to have plotted two failed attacks on American soil.
The group has taken advantage of a year of turmoil in Yemen to seize control of several regions in the south. Militants overran cities as the government focused its efforts on protecting the regime in the capital during a year of protests against former President Ali Abdullah Saleh.
Saleh's replacement, Abed Rabbo Mansour Hadi, has made fighting al-Qaida one of his top priorities, but many Yemenis accuse the ousted president, whose loyalists are still influential in the military and in government bodies, of undercutting security operations and the new president's authority.
Also Friday, suspected al-Qaida militants attacked an underground gas pipeline that extends from the Balhaf area in Shabwa to an export terminal on the Arabian Sea, military officials said. They did not have further details on the late-night attack. Residents said it started a massive fire.
The French company Total runs the gas field and pipeline in Balhaf. The line was attacked late last year as well.
In the southern city of Aden, suspected militants opened fire on a powerful tribal sheik who sits in Yemen's upper house of parliament as he was coming out of a mosque. His two bodyguards were killed in the attack but he was unharmed, according to medical officials.
Mohammed Hussein Ashal's tribe fought al-Qaida last year in Mudya district in Abyan province near Aden, kicking them out of several towns.
Militants killed Ashal's son last year in the capital Sanaa, and have also targeted other officials in Aden, shooting dead an intelligence chief in December.
All officials spoke on condition of anonymity because they were not authorized to speak to media.