WASHINGTON: US officials believe Russia is working to fabricate evidence concerning last week’s deadly strike on prison housing prisoners of war in a separatist region of eastern Ukraine.US intelligence officials have determined that Russia is looking to plant false evidence to make it appear that Ukrainian forces were responsible for the July 29 attack on Olenivka Prison that left 53 dead and wounded dozens more, a US official familiar with the intelligence finding told The Associated Press on Wednesday.Russia has claimed that Ukraine’s military used US-supplied rocket launchers to strike the prison in Olenivka, a settlement controlled by the Moscow-backed Donetsk People’s Republic.The Ukrainian military denied making any rocket or artillery strikes in Olenivka. The intelligence arm of the Ukrainian defense ministry claimed in a statement Wednesday to have evidence that local Kremlin-backed separatists colluded with the Russian FSB, the KGB’s main successor agency, and mercenary group Wagner to mine the barrack before “using a flammable substance, which led to the rapid spread of fire in the room.”The official, who was not authorized to comment publicly and spoke on the condition of anonymity, said the classified intelligence — which was recently downgraded — shows that Russian officials might even plant ammunition from medium-ranged High Mobility Artillery Rocket Systems, or HIMARS, as evidence that the systems provided by the US to Ukraine were used in the attack.Russia is expected to take the action as it anticipates independent investigators and journalists eventually getting access to Olenivka, the official added.Ukraine has effectively used HIMARS launchers, which fire medium-range rockets and can be quickly moved before Russia can target them with return fire, and have been seeking more launchers from the United States.