Jan. 28 (UPI) -- At least five people were killed and two were injured after a Russian drone strike on a cross-country passenger train they were riding in Ukraine's northeastern Kharkiv region, authorities said.

The Kharkiv prosecutor's office said late Tuesday that Russian forces targeted the train with three Shahed-type attack drones, one of which struck a passenger car and the locomotive, setting them ablaze, while two others detonated nearby.

The attack occurred near Barvinkove near the border with Donetsk province as the train was nearing the end of an 830 mile journey from Chop in Ukraine's far southwest on the Slovakia/Hungary border, via Lviv, according to Kharkiv Gov. Oleh Syniehubov and Ukrainian Railways.

The prosecutor's office attributed the attack to the "Ossetian Army," but it was unclear if it was referring to Russian Federation forces stationed in South Ossetia that were redeployed to the region at the start of the war, or South Ossetia militias who have been fighting on the side of pro-Russian separatists in the Donbas since 2014.

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