The air raids came as U.N. special envoy to Yemen, Ismail Ould Cheikh Ahmed, was visiting the Yemeni capital, in an effort to arrange a humanitarian pause in fighting between Houthi militias, whom Saleh is allied to, and the Saudi-led coalition.

The coalition has orchestrated a more than three-month bombing campaign against the Houthis and army units loyal to Saleh to try to restore President Abdrabbu Mansour Hadi, who is in exile in Riyadh.

The General People’s Congress party’s assistant secretary general, Faeqa al-Sayed, told Reuters the party headquarters had been destroyed.

“This will not make us back down on our efforts …. to create the suitable environment to cooperate with the United Nations,” she said in a statement on the party’s website.

The strikes late on Sunday also struck the home of former president Saleh’s nephew and several houses belonging to Houthi supporters in the south and west of the capital Sanaa, according to Reuters.