(QHA) -

Human Rights Watch (HRW) has accused Ukrainian government forces of using cluster munitions in populated areas in the eastern city of Donetsk earlier this month.

The New York-based group said on October 20 that it documented “widespread use” of cluster munitions in fighting between government forces and pro-Russian separatists in more than a dozen locations.

HRW said it was not possible to determine responsibility for many of the attacks, but added that there is “strong evidence” that Ukrainian government forces were responsible for several cluster munition attacks on Donetsk.

HRW said the use of cluster munitions, which scatter multiple smaller devices over a large area, in populated zones violates the laws of war due to the indiscriminate nature of the weapon and that their use "may amount to war crimes."

Also on October 20, Amnesty International said both rebels and Ukrainian forces may be guilty of "execution-style and other deliberate" killings in the conflict in eastern Ukraine.