Russia has struck ammunition warehouses of the Ukrainian armed forces in Kharkov and the Kharkov region, Nikolaev underground network coordinator Sergey Lebedev told Sputnik on Friday.
"A report from Kharkov: 'Kharkov, 03:20 am local time [00:20 GMT], explosions in Kharkov. They are loud in the western district. A siren went off due to the explosions, ambulances are rushing to the western part of the city without sirens, but with flashing lights'," Lebedev said.
A Ukrainian air defense missile was presumably launched at the moment, and an explosion was heard one minute later, the coordinator said, adding that he had not received any exact information on the matter yet.