Moscow, April 3. /TASS/. People have been bringing flowers and candles to the St. Petersburg government’s office in Moscow to commemorate those who died in Monday’s metro blast, a TASS correspondent reports. Red carnations and roses may be seen in front of the office building in Spiridonovka Street in downtown Moscow. 

The administration of St. Petersburg has declared three days of mourning starting Tuesday. 

"Tomorrow, at nine o’clock in the morning, a Book of Condolences will be open at the office so everybody will have a chance to convey their condolences," a source in the St. Petersburg government’s Moscow office said.

According to earlier reports, a blast hit a metro can in downtown St. Petersburg killing nine and injuring nearly 50 people.

In light of the St. Petersburg metro blast, transport security measures have been tightened in Moscow. Moscow mayor Sergei Sobyanin conveyed his condolences to the families and friends of those killed.