Heavy fighting between Syrian army forces and rebels erupted on the Golan Heights on Monday, a Reuters photographer said, but it was unclear if either of the two sides had gained an advantage to control a key frontier crossing.

Rebels of al-Qaida-linked Nusra Front have been battling the Syrian army in the area and have wrested control of the crossing at Quneitra, which is operated by the United Nations.

Persistent small arms fire and explosions from mortar shells and other munitions could be heard on the Israeli-controlled side of the frontier of the strategic plateau, the photographer reported.

At least one tank belonging to the Syrian army loyal to President Bashar Assad was also involved and rebels could be seen a few meters (yards) away from the frontier fence.

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