Muammar Gaddafi's forces may have executed scores of prisoners and killed civilians as rebels overran the Libyan capital last week, Human Rights Watch said on Sunday.
Tripoli's streets are littered with rotting corpses and the debris of war after heavy fighting by rebels to end Gaddafi's 42-year rule, though the deposed leader remains at large.
"The evidence we have been able to gather so far strongly suggests that Gaddafi government forces went on a spate of arbitrary killing as Tripoli was falling," Sarah Leah Whitson, HRW's North Africa director, said in a statement.
Some 18 bullet-riddled bodies, two with their hands bound, were found in a riverbed near Gaddafi's Bab al-Aziziya complex and witnesses told HRW they had been killed by Gaddafi fighters, the statement said.
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