About ten people were killed and others were injured on Monday in an explosion in the metro city of St. Petersburg, Russia, while the authorities announced that it has opened an investigation into a "terrorist act".
The Commission said in a statement Russian investigation "investigation was opened about + terrorist act '", adding that investigators would discuss "all other possible hypotheses."
President Vladimir Putin said, "We are still studying all the possibilities certainly: accidental and criminal and above all work with a terrorist nature."
The President in St. Petersburg to participate in a meeting with reporters Ross and offered "condolences" to the families of the victims.
In a brief televised address ahead of a meeting with his Belarusian counterpart Alexander Lukashenko, Putin said: "We will start, unfortunately, we met with this tragic incident. Causes not yet known as it is too early to talk about them, and the investigation will be defined."
The National Committee for the fight against terrorism and announced that found a homemade bomb in one of the subway stations in the city, a remote blast.
The Committee confirmed that "in the subway station, Bloushad Faustinyia, found a hand-made bomb was dismantled in a timely manner."
Cars rushed emergency services to the scene at the Technological Institute Metro Station, a major center.
Said Andre Kibetov, spokesman for the governor of St. Petersburg, "We do not know the exact number of dead but about ten people."
He said about 50 people were injured, two of them undergoing emergency surgery.
- scenes stagger -
The explosion occurred at 14.40 (11.40 GMT), according to the spokesman for the Counter-Terrorism channel Russia -24, Andrei Bryazdomski.
The investigators arrived at the scene to determine the cause of the explosion, according to a statement issued by the public prosecutor in the city.
The explosion caused scenes of confusion, with preventing traffic in Moskovsky Prospect, the busy street while the emergency vehicles heading to the station quickly.
He said retired Vyacheslav Vezilov told AFP, "I was in the metro station and the Institute Tknulogistica train stopped but did not open the doors. Through the window, I saw four bodies."
The Galina Stepanova (38 years) outside the station. She said, "I saw people coming out, and they were like deaf, held their heads. And took over the rescue teams to provide assistance to them very quickly."
In turn, Natalia said outside the station while she was trying to make a phone call, "my mother was on the subway, I do not know what happened to her, I can not reach it."
A source in the Russian Ministry of Emergency Situations "Initial reports indicate that 10 people have been killed and 20 others have been injured."
The source of the security forces said earlier told RIA Novosti news agency, said that "the explosion occurred in one of the train carriages, and resulted in the victims."
According to the media device Metro in the second Russian city, that all metro stations were closed, and that the explosion took place in a train carriage with the presence of two stations in the southwest of St. Petersburg.
Showed the first images broadcast by social networking and Russian television networks, one of the metro locomotives destroyed by the blast, and a large number of travelers are trying to bring out the injured from the rubble.
For his part, Moscow Metro said on Twitter that "additional security measures were taken," as required by law in such cases.
The organization called on the Islamic state to hit Russia after the start of its intervention in support of Syrian President Bashar al-Assad's forces in September 2015.
Since then, Russia suffered a large number of attacks, but they signed all the republics of the Russian Caucasus is unstable.
The Russian security services announced that it has repeatedly ruled on jihadist cells was preparing to hit Moscow and St. Petersburg.
In 2013, Russia suffered a double suicide attacks killed 34 people and raised the case of concern about the Winter Olympics in Sochi security.
A bomb explosion has resulted in the main railway station in the southern city of Volgograd killed 18 people, while another attack targeted a passenger bus, killing 16 people.
The suicide attack on the Domodedovo airport in Moscow, adopted by Islamist rebels from the North Caucasus killed 37 people in January 2011.
"Islamic emirate" led by Doku Umarov has claimed responsibility for the attack.