ST. PETERSBURG, April 3. /TASS/. Russian President Vladimir Putin late on Monday laid flowers at St. Petersburg’s Tekhnologichesky Institut metro station rocked by a blast earlier in the day, a TASS correspondent reported from the site.

The president stepped out of his car in Moskovsky Prospekt Avenue with a bunch of scarlet roses and laid it at the site where the city’s residents leave flowers in memory of those killed in the terror attack.

The president refrained from speaking with journalists.

"Vladimir Putin arrived at the entrance way to the Tekhnologichesky Institut metro station where he laid flowers in memory of those killed in today’s metro blast," Putin’s press secretary Dmitry Peskov said.

A bomb went off at about 14:40 Moscow time on Monday in a metro train car when the train was moving from Tekhnologichesky Institut Station to Sennaya Ploshchad Station in St. Petersburg. The Russian Investigative Committee has qualified the blast as a terrorist attack, but other versions are looked into.

According to the National Anti-terrorist Committee, the blast claimed 11 lives.