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.

Nine days after disaster, two pulled alive from Nepal hydropower tunnel
Germany launches manhunt after spate of sabotage attacks on power grid
Air India sack Phuket-Delhi pilot who failed drug test
Wildfires spread near Indonesia's new capital, prompting calls for action
Philippine court issues warrant for VP Duterte's arrest in grave threats case
Typhoon Saudel brings torrential rain, flooding to China's coastal areas
US investigates deadly strike on Iranian wedding
India food safety crackdown targets company of Nepal's 'Noodle King'
