Islamic State militants fought Friday against armed groups inside a refugee camp in the Syrian capital, Damascus, and have made new advances inside the camp, Palestinian officials and activists said.

The militants stormed the Yarmouk camp on Wednesday, marking the Islamic State’s deepest foray yet into Damascus. They were expelled Thursday but officials said they re-entered the camp Friday.

One Palestinian official, Khaled Abdul-Majid, said the group is in control of half of the camp. The London-based Syrian Observatory for Human Rights also reported new advances by the group inside the camp. […]