Ten dead after St Petersburg blast
Ten people have been confirmed dead following a blast on the underground in St Petersburg.
Three metro stations have been closed, as reported by local media outlet Fontanka.
Interfax also stated that about 10 had died, with about 20 injured.
Russian president Vladimir Putin, who is due to visit the city on Monday, confirmed there are dead and injured.
He expressed his condolences and said he had spoken to the heads of the security services, who are trying to establish the cause.
A Reuters witness saw eight ambulances near the Sennaya Ploshchad metro station. Another agency, RIA Novosti, said there appeared to have been blasts at two metro stations.