SANAA, Yemen (AP) -- A suicide car bomber rammed his vehicle into the police chief's house in the southern Yemeni city of Aden on Sunday, killing seven civilians and security forces in a failed assassination attempt after militants killed two other security officials elsewhere in the country.
Police Chief Shallal Shayei survived a similar assassination attempt last month, as did the governor of the province earlier this month. Aden's previous governor was killed in an attack claimed by a local Islamic State affiliate.
Ambulances raced to the police chief's house after the explosion, which could be heard across the city, witnesses said. Officials said an armored vehicle blocked the suicide car bomber meters from the gates of the house. Seven people were killed and 12 injured after the explosion ripped through a bus that was passing by.
Yemen has been mired in a conflict pitting the Shiite Houthi rebels against the internationally-backed government, which is allied with a Saudi-led coalition. The fighting has killed more than 5,800 people since last March, when the coalition began striking Houthi targets from the air.
The chaos has allowed a powerful local al-Qaida affiliate and a more recently formed branch of the Islamic State group to expand their reach, including in Aden, Yemen's commercial hub.
U.S. drones have carried out a number of strikes since the start of the year targeting al-Qaida militants, according to security officials and witnesses, who said drone strikes killed 13 militants on Sunday in Jaar, a town seized by al-Qaida last year. They did not know the affiliation of the militants.
It was not immediately possible to confirm the account. U.S. officials rarely speak publicly about the covert drone program.
The Saudi-led coalition meanwhile appears to have stepped up airstrikes in northern Yemen targeting the Houthis and allied army units loyal to a former president. Residents said the coalition launched at least 35 strikes on Sunday in the capital and the northern province of Jawf.
In Saada, the Houthis' northern heartland, Houthi officials and witnesses said an air raid killed at least 30 people on Saturday. It was not clear if they were civilians or fighters.
Elsewhere in Yemen, Police Chief Adel al-Asbahi of Bayda province was killed by a bomb planted in his vehicle on Sunday, while Mohammed al-Dhali, of the special forces, was gunned down by attackers on a motorcycle in the rebel-held capital, Sanaa. No group has claimed responsibility for the killings.
All officials spoke on condition of anonymity because they were not authorized to speak to the press. Witnesses requested anonymity for security reasons.