BEIRUT (Reuters) - Ministers from Hezbollah and its Lebanese allies resigned Wednesday, toppling the government of Prime Minister Saad al-Hariri before expected indictments against the group over the killing of Hariris father. Lebanese politicians had said Tuesday that Saudi Arabia and Syria failed to reach a deal to contain tensions over the UN-backed tribunal, which is expected to issue draft indictments soon over the 2005 assassination of Rafik al-Hariri. The ministers resigned as Saad al-Hariri was meeting US President Barack Obama in Washington. Hezbollah has denied any role in the killing. Its leader, Sayyed Hassan Nasrallah, has attacked the tribunal as an Israeli project and urged Hariri to renounce it. The Sunni Muslim premier has resisted Hezbollahs demand. Clearing the way for the formation of a new government ... the ministers present their resignations, hoping that the president will quickly take the required steps for forming a new government, said Gebran Bassil, a Christian government minister speaking for Hezbollah and its allies. He said Hariri had rejected demands for an urgent cabinet session to discuss Hezbollahs insistence that Lebanon withdraw all cooperation with the special tribunal. The grace period has ended, and the waiting stage that we lived through without any result has ended, he told Reuters. Stalemate over the tribunal has crippled Hariris 14-month-old unity government.