Syrian activists say rebel infighting in the east has killed more than 630, displaced 130,000

Syrian activists say more than 630 people have been killed and at least 130,000 have been displaced in more than a month of rebel infighting in an eastern province near the Iraqi border.

The Britain-based Syrian Observatory for Human Rights says 39 civilians are among the 634 people killed in Deir el-Zour province since April 30.

The fighting is between Islamic rebel battalions and the al-Qaida breakaway group known as the Islamic State of Iraq and the Levant.

The Observatory said Tuesday the tally includes 354 rebel fighters, including many from the al-Qaida-affiliated Nusra Front, and 241 gunmen from the Islamic State.

Islamic rebels and more moderate factions have been locked in a brutal fight against the Islamic State across opposition-held northern Syria since early January.