Just last week, Russian President Vladimir Putin thanked President Donald Trump and USA intelligence for a tip that led to the arrest of a suspected terrorist cell plotting bombings in St. Petersburg.
An explosion at a supermarket in the Russian city of Saint Petersburg injured at least four people Wednesday, officials said, with investigators working at the scene after moving shoppers away.
Over 50 panicked shoppers have been evacuated from the building after police, bomb-disposal experts and other rescue services arrived at the scene.
The Sputnik news agency reported that the Committee believe an improvised explosive device "filled with projectiles" caused the blast.
"As a result, several people have been injured", the Saint Petersburg police said, giving the incident's location.
It was reported that only a wall and a cash register inside the supermarket were damaged in the blast.More news: Marijuana Use By Pregnant Women On The Rise
Nine persons have been taken to hospitals, the city's deputy governor's office spokesperson said.
An official told Russian news sources: "There was a bang".
"There is no fire".
That bombing was claimed by a group linked to Al-Qaeda which said it was a message to countries engaged in war with Muslims.
FSB director Alexandra Bortnikov said earlier in December that around 4,500 Russian citizens had travelled overseas to participate in "terrorist" groups.