Fighting among Syrian rebels kills more than 50 - British monitor

BEIRUT (Reuters) - Fighting between insurgent groups east of Damascus killed more than 50 people on Monday, bringing to more than 500 the number of people killed in rebel infighting since late April, the Syrian Observatory for Human Rights reported.

The fighting pits Jaish al-Islam, which is part of the opposition High Negotiations Committee (HNC), against rival faction Failaq al-Rahman, and is threatening Jaish al-Islam's dominant position in Eastern Ghouta just outside Damascus.