Airwars director Chris Woods said the organization will “continue to track Russian civilian casualty allegations on a daily basis,” but will suspend its detailed case-by-case assessments for the near future.

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“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. “These reported casualty levels are comparable with some of the worst periods of Russian activity in Syria.”

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.

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Last week, U.S. drones targeted what locals deemed a mosque in Aleppo province in a bid to target al-Qaeda leaders. U.S. officials said dozens of terrorists were killed, but those on the ground said at least 47 civilians also died in the strikes. The Pentagon denied that there were any civilian casualties but has launched a formal investigation into the incident.

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On Monday, a conflict monitoring group, the Britain-based Syrian Observatory for Human Rights, 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. The Pentagon admitted U.S. aircraft were operating in the vicinity but, according to Pentagon spokesman Eric Pahon, the military is having a hard time rectifying the location of the building that was targeted with what was shown as destroyed on social media.

On Thursday, Iraqi media reported that an airstrike in Mosul killed more than 200 people. The Pentagon is investigating the claims.

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After the fall of Aleppo to Syrian and Russian forces in December and the recent escalation of the U.S.-led campaigns against the Islamic State in Mosul and Raqqa, claims of civilian casualties caused by American-led forces have outstripped those caused by Damascus and the Kremlin, according to Airwars.

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As Syrian forces advance into opposition-held Hama in central Syria, Airwars has recorded roughly 50 civilian casualty events caused by the joint Russian and Syrian air campaign in March.

Airwars uses varying methods to investigate and confirm civilian casualties, relying on a medley of local news outlets, NGOs, civilian volunteers and social media to determine if casualty reports are fair, weak, contested or disproved. For March, nearly half the alleged strikes are contested, according to Airwars data.

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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. In recent months, the Pentagon said it has taken strides to investigate a backlog of claims while starting to release monthly civilian casualty assessments.

“The decision to temporarily suspend our Russia strike assessments has been a very difficult one to take,” Woods said. “Moscow is still reportedly killing hundreds of civilians in Syria every month. But with Coalition casualty claims escalating so steeply – and with very limited Airwars resources – we believe our key focus at present needs to be on the U.S.-led alliance.”