More than 2,000 Syrians – almost half of them pro-government forces – have been killed in just over two weeks of fighting in Syria, making it one of the worst death tolls in the country’s civil war, opposition activists said Monday.

The report reflects a recent surge in deadly attacks by the al-Qaida-breakaway Islamic State group targeting government forces, signaling shifting priorities as Sunni militants seek to consolidate power in areas under their control.

President Bashar Assad’s forces have gained momentum in the fighting with rebels seeking to topple him from power. Infighting also has hurt the rebel cause, with Islamic extremists battling moderate fighters. […]