BEIRUT - Syrian government warplanes killed at least 60 civilians including a dozen children in two days of air strikes on Islamic State-held territory at the weekend, activists said on Monday. President Bashar Assad's military has stepped up an aerial campaign over the last three months against Islamic State, an al-Qaida offshoot that controls about a third of Syria's territory, much of it desert in the north and east. The air strikes have hit a number of Islamic State targets but have also killed many civilians in territory under the group's control.
