CAIRO — Libyan rebels appear to have “summarily executed” scores of fighters loyal to Moammar Gadhafi, and probably the dictator himself, when they overran his hometown a year ago, a human rights group said today.

The report by Human Rights Watch on alleged rebel abuses that followed the October 2011 capture of the city of Sirte in the final major battle of the eight-month civil war is one of the most detailed descriptions of what the group says were war crimes committed by the militias that toppled Gadhafi.

The 50-page report, titled “Death of a Dictator: Bloody Vengeance in Sirte,” details the last hours of Gadhafi’s life on Oct. 20, 2011, when he tried to flee the besieged city. His convoy was struck by NATO aircraft as it tried to escape and the survivors were attacked by militias from the city of Misrata, who captured the dictator.

Misrata was subjected to a brutal weeks-long siege by Gadhafi’s forces that killed hundreds. HRW says it seems the rebels took revenge against their prisoners in Sirte.