St Petersburg metro
There was only one blast in St Peterburg's metro system which happened in a train in between two stations, a source in Russia's emergency services said on Monday.
"There was one blast in one site in between (stations) as the train arrived at the Technology Institute station from Sennaya (Ploshchad) station," the source told Reuters.
Russian media reported earlier that there were two blasts. Ten people have been killed in the incident, authorities said.
Europe became the second region after Latin America to surpass 250,000 deaths on Saturday, according to a Reuters tally, with record numbers of daily COVID-19 infections reported in the past two weeks. | Video