Yemeni political groups, including Shiite rebels known as Houthis, gathered at the airport in the capital, Sanaa, on Sunday, preparing to travel to Geneva for U.N.-led peace talks, officials said.

Abdulmalik Agra, a member of the rebels' political council, told The Associated Press that its group included a Houthi leader, Mehdi Mashat, official Ali Hamza al-Houthi, and three others — including men from the party of former President Ali Abdullah Saleh, a rebel ally.

They decided to attend the talks after the United Nations agreed to broaden the structure so they were not based solely on two warring sides. Members of the Socialist and Haqq parties were also joining.

A day earlier, a plane meant to carry the rebels and their allies to the talks left Yemen without the delegates on board, casting doubt on whether the meetings would go forward as planned. The talks are slated to be first substantive meetings by all parties involved in the conflict.

The delegation representing the government of embattled President Abed Rabbo Mansour Hadi arrived in Geneva Saturday morning.

Security officials, who spoke on condition of anonymity because they were not authorized to brief journalists, said that Saudi-led airstrikes against the rebels and their allies continued in several Yemeni provinces, including Aden, Taiz, Saada and Hodeida. Violent clashes continued in Marib province, while rebel forces took control of al-Jawf province after clashes with tribesmen loyal to Hadi.