At least two bombs went off Monday on the St. Petersburg Metro.

At least ten people are dead.

One of the bombs was filled with nails.

Two nail bombs on St Petersburg metro kill at least 10 as Putin visits city for meeting https://t.co/NQQ7rWExxb pic.twitter.com/WrEKhz9zkH — Daily Mail Online (@MailOnline) April 3, 2017

A door was blown off the train.

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BREAKING: St. Petersburg subway press office: Explosive device was set off on a train in the Russian city. — The Associated Press (@AP) April 3, 2017

A video shows a huge hole in the side of the Metro train in St. Petersburg.

Watch deadly blast in St Petersburg. The blast killed 10 and caused injuries. pic.twitter.com/h7NgbLxBgo — A Anderson (@Ward4Anderson) April 3, 2017

At least 10 killed and 30+ injured in twin blasts on Metro trains at #StPetersburg pic.twitter.com/h0bTnzshXx — REAL FRESH NEWS (@MVT_NEWS) April 3, 2017

MORE VIDEO From Russia Today.

At least 50 injured….