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 Gulf country has been working alongside the United States and Egypt for months on fruitless talks between the warring sides in Gaza and any disengagement from that process could further complicate efforts to reach a deal.

The Qatari Foreign Ministry announced it had stepped back from talks, saying it would resume once Israel and Hamas “show willingness and seriousness.”