A car bomb exploded in front of a mosque in the capital Sanaa Saturday afternoon, killing at least two people and wounding six others, security officials said.

The officials, speaking on condition of anonymity because they were not authorized to brief reporters, said the bomb targeted the Qabat al-Mahdi mosque in the old city of Sanaa.

No group took immediate responsibility for the attack. On Wednesday a series of Islamic State-claimed bombings in the capital killed at least four people and wounded 60.

This comes as Saudi-led coalition airstrikes continued Saturday, hitting the Sanaa International Airport and a nearby air force base. Warplanes also hit targets in Aden, Lahj, Jawf, and Saada. The campaign, aimed at pushing back Shiite Houthi rebels, started on March 26.

Yemen's conflict pits the Houthis and their allies against an array of forces, including southern separatists, local and tribal militias, Sunni Islamic militants and loyalists of exiled President Abed Rabbo Mansour Hadi.

Yemen's exiled government and Shiite rebels who control the capital failed to come to terms on even a temporary cease-fire Friday as U.N.-brokered talks in Geneva ended without an agreement.