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The report threatens to further undermine a Sept. 5 truce, which helped reduce casualties after the fighting that broke out following Russia’s annexation in Crimea in March killed more than 3,500 people, according to the United Nations. Clashes have continued daily since the ceasefire deal, hindering efforts to reach a permanent peace agreement.

The New York Times reported that physical evidence and interviews with witnesses and victims indicate that government forces fired cluster munitions into the center of Donetsk on several occasions.

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While it was “not possible to conclusively determine responsibility for many of the attacks, the evidence points to Ukrainian government forces’ responsibility” for several incidents in Donetsk, the largest city in the combat zone, Human Rights Watch said.

Cluster bombs are able to release dozens of “bomblets” over a wide area and are banned in many countries. The weapon’s “indiscriminate” nature makes its use a violation of the laws of war and may amount to war crimes, according to Human Rights Watch.

The 2010 Convention on Cluster Munitions has been joined by 114 nations. Ukraine, China, Russia, the United States, Israel, Syria, India, Pakistan and Brazil are among countries that haven’t signed, according to its website.

During a week-long investigation, Human Rights said it documented 12 incidents of cluster munitions killing at least 6 people, including a Swiss employee of the International Red Cross, according to the statement.

Government forces are focusing on keeping hold of Donetsk Airport, the target of daily rebel attacks, and are “not even able to shell Donetsk with any weapon,” said Andriy Lysenko, a spokesman for the country’s military. He blamed the insurgents for residential areas coming under attack and urged an investigation.