Israel launched an audacious attack on Hamas leaders in Qatar on Tuesday.
Qatar, which has acted as a mediator alongside Egypt in talks on a ceasefire in the almost two-year-old war in Gaza, condemned the action as "cowardly" and called it a flagrant violation of international law.
Several blasts were heard in Qatar's Doha.
Two Hamas sources told Reuters that Hamas officials in the ceasefire negotiating team survived the attack.
Israeli officials told Reuters the strike was aimed at top Hamas leaders including Khalil al-Hayya, its exiled Gaza chief and top negotiator.
Al Jazeera television, citing a Hamas source, said the attack was aimed at Hamas Gaza ceasefire negotiators.

Palestinian teen shot dead in Israeli West Bank raid, Wafa reports
Libya says 17 migrants perish at sea, nine missing feared dead
Israel begins intercepting Gaza aid ships far from shores, army radio says
Trump urges Iran to sign a deal and discusses prolonged blockade
Seven people die in hospital wall collapse in southern India