Russian and Syrian jets stepped up their bombing of an Islamic State bastion along the Jordan-Israel border in southwestern Syria, as the militants pushed into areas abandoned by other rebel groups, diplomatic and opposition sources said.
Israeli authorities say hundreds of fires have been started by firebombs since April.
Iran faces increased US pressure and looming sanctions after Trump's decision to withdraw the United States from a 2015 international deal over Iran's nuclear programme.
The Israeli military said that it had completed "a humanitarian effort to rescue members of a Syrian civil organisation and their families".
Militants killed 10 Iranian Revolutionary Guards in an attack on a post on the Iraqi border on Saturday, Iran's semi-official Tasnim news agency reported, the latest deadly clash in an area where armed opposition Kurdish groups are active.
France and Russia on Saturday despatched a plane carrying humanitarian aid to the ravaged former Syrian rebel enclave of Eastern Ghouta, which was retaken by government forces in April after a five-year siege.
A ceasefire announced by Hamas largely held Saturday after a wave of deadly air strikes across the Gaza Strip sparked by the death of an Israeli soldier shot near the border.