A non-profit organization that tracks civilian casualties caused by airstrikes in the Middle East said it has shifted nearly all of its resources to track a surge of claims regarding U.S.-led strikes in Syria and Iraq. The group, called Airwars.org, had been tracking deaths caused by both Russian and U.S. airstrikes. "Almost 1,000 civilian non-combatant deaths have already been alleged from coalition actions across Iraq and Syria in March - a record claim," Airwars said in a statement. In the last week, three mass casualty incidents have been attributed to U.S.-led forces in Iraq and Syria, making March one of the most lethal months for civilians in the the two-year-old war against the Islamic State. Last week, U.S. drones targeted what locals deemed a mosque in Aleppo province in a bid to target al-Qaeda leaders. Those on the ground said at least 47 civilians ... died in the strikes. On Monday, a conflict monitoring group ... said a strike near Raqqa targeted a school that was serving as a home for multiple families displaced by fighting in the area, killing at least 33. On Thursday, Iraqi media reported that an airstrike in Mosul killed more than 200 people. According to Airwars, more than 2,500 civilians have been killed by the U.S.-led coalition, which has admitted to killing only roughly 220 civilians.