One of the top rebel commanders in eastern Ukraine, Alexei Mozgovoi, has been killed in an attack on his car, Russian and Ukrainian media report.
Mr Mozgovoi led the “Prizrak” (Ghost) battalion which was based in the Alchevsk area of Luhansk.
Reports said a bomb struck his car, which was then targeted by gunfire that killed Mozgovoi and six others.
Mr Mozgovoi was a critic of the Russian-backed separatist leadership and the Minsk accord signed with Kiev.
He took control of Alchevsk as part of the uprising that began last April in eastern Ukraine’s Luhansk and Donetsk regions following Russia’s annexation of Crimea.
There are no details on who may have carried out the attack, which was said to have taken place on the road from Luhansk to the city of Alchevsk.