Washington (CNN) Afghan government, US and international forces have been responsible for more civilian deaths in Afghanistan in the first three months of 2019 than the Taliban and ISIS, according to a United Nations report out Wednesday.

This marks the first time since 2009, when the UN Assistance Mission in Afghanistan began documenting civilian deaths and injuries, that the number of deaths caused by pro-government forces during the first quarter of 2019 surpassed those the UN attributed to insurgent groups.

According to the UN report, the Taliban, ISIS and other insurgents were responsible for the majority of civilian casualties, which include deaths and injuries. Overall, the number of casualties saw a 23% decrease from the first quarter of 2018, the UN found.

The terrorist groups killed 227 civilians and injured 736 more in the first quarter of 2019, according to the UN.

In that same period, pro-government forces caused 305 deaths and 303 injuries among civilians -- a 39% increase from 2018's first quarter, the report notes.

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