BEIRUT — Syrian activists report intense fighting on Saturday between government troops and rebels trying to tighten their siege of two military bases in the northeast.

Israel Radio reported that at least 200 Syrians had been killed at the hands of the Bashar Assad regime since Friday, mostly around Damascus and Aleppo.

The Britain-based Syrian Observatory for Human Rights and the Local Coordination Committees say rebels destroyed at least one tank near the town of Khan Sheikhoun in Idlib province on Saturday.

Rebels have been attacking the nearby bases of Wadi Deif and Hamdiyeh for weeks. The Observatory said the rebels are trying to cut roads that supply the two bases.

Besieged government bases are a recent focus of fighting in Syria’s conflict, which according to the UN has killed more than 60,000 people since March 2011.

Last week rebels captured the nearby airbase of Taftanaz, dealing a significant blow to President Bashar Assad’s regime.