The operator of the Athens metro has said that it shut down the station at Panepistimio in the city center following a suicide.
Initial reports said a man threw himself onto the tracks in front of an incoming train.
Line 2 of the metro will run from Anthoupoli to Metaxourgio and from Syntagma to Elliniko until the station is reopened.
A suspected bomb blast inside a car of the St. Petersburg Metro system has resulted in casualties among passengers. The entire transit system is shut down as bomb squads and rescuers respond to the emergency.
An explosion has hit an underground station in the city of St Petersburg, Russian media report.
At least 10 people are believed to have died after two explosions on the Saint Petersburg subway.
The Tass and Interfax agencies reported a blast at the Sennaya Ploshchad metro station, which left a number of victims.
At least nine people were killed and 20 injured when an explosion tore through a train carriage in the St. Petersburg metro system on April 3, the Russian National Anti-Terrorist Committee said, according to Reuters.
Interfax news agency quoted an unnamed source as saying the blast, which occurred when the train was between two stations, was caused by a bomb filled with shrapnel.