U.S.-led coalition airstrikes have killed more than 1,000 Islamic State fighters since September, with the Pentagon reporting more than $1 billion being spent fighting ISIS.
The Syrian Observatory for Human Rights (SOHR) released a report stating 1,171 people have died since the airstrikes began, with no less than 800 others wounded.
"At least 1,171 have been killed in the Arab and international air strikes (since September 23), including 1,119 jihadists of the Islamic State group and Al-Nusra Front," SOHR reported.
SOHR, which relies on a network of activists and hospitals in the region for its data, believes the actual number of casualties may be higher.
"We, in SOHR, believed that the real number of casualties in ISIS is more than our number, because there is absolute secrecy on casualties and due to the difficulty of access to many areas and villages that have witnessed violent clashes and bombardment.”
Of the casualties, 52 were civilians; including 8 children and 5 women.
A total of 1,046 members of ISIS are among the dead, reports Yahoo News. The dead also included 72 members of Al-Qaeda’s branch in Syria, the Al-Nusra Front, and the death of one jihadist prisoner whose affiliation was unknown.
NPR reports the Pentagon has spent more than $1 billion fighting ISIS since the airstrikes began.
"As of Dec. 11, 2014, the total cost of operations related to [ISIS] since kinetic operations started on Aug. 8, 2014, is $1.02 billion and the average daily cost is $8.1 million," Pentagon spokesman Bill Urban said.
The average daily cost was previously reported as more than $7 million a day, but the amount increased due to the number of airstrikes and related costs.
Through Dec. 15, there have been a total of 488 airstrikes in Syria led by the United States.