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.

Bangladesh elects ruling party veteran Alamgir as president
Russian strikes kill 16 in Ukraine's Kyiv
Prince Harry and Meghan to move back to Britain
North Korea launches 10 ballistic missiles as US-South Korea drills near end
Kenya tourist helicopter crash kills seven