Yemeni peace talks in Switzerland were halted on Friday after the country ' s Shiite rebel delegation suspended all meetings with the internationally recognized government in protest over its cease - fire violations, members of Yemen ' s two warring sides told The Associated Press. The rebels, known as Houthis, said they would not resume talks unless the U.N. condemned the breaches by government forces of the week-long truce, the delegates said. Houthi fighters have also ignored the cease-fire agreement. But the United Nations, which is mediating the talks, cast doubts on the alleged suspension. "In my latest meeting with the heads of delegations, they all renewed their commitment for a ceasefire," the U.N. special envoy for the country, Ismail Ould Cheikh Ahmed, tweeted Friday evening. The deputy spokesman for the U.N. secretary-general, Farhan Haq, told the AP that the U.N. had no confirmation of any suspension of talks and that Ahmed "remains in touch with the parties." The U.N. later said Ahmed "held several sessions with the participants on the fourth day of the peace talks." Its statement also said Ahmed was "deeply concerned at reports of violations of the cessation of hostilities announced earlier today." The U.N. has urged all factions in the conflict to end the violence and is pressing to keep the talks going. The Houthis appeared to be tactically stalling to avoid meeting their obligations under a deal reached with the government a day earlier, government delegates told the AP.