Qatar is suspending its role as a mediator in talks between Israel and Hamas after concluding that the two sides are no longer negotiating in good faith, two sources familiar with the situation tell CNN.

The announcement comes after growing frustration with the lack of progress on a cease-fire deal. But one official said Saturday that Qatar is highly likely to return to the efforts if both sides show “serious political willingness” to reach a deal on the war in Gaza.

Qatar has suspended its work as a mediator in ceasefire and hostage release talks between Israel and Hamas, officials say. The country said it would resume its work when Hamas and Israel "show their willingness" to negotiate.