The blast comes after a suicide bombing killed 15 people and wounded dozens on the Saint Petersburg metro in April.
The Egyptian foreign ministry's statement renewed Egypt's call for the need to unite worldwide efforts to fight terrorism and its funding resources. According to a spokesman for the governor of St. Petersburg, one person was in serious condition.
Russian President Vladimir Putin declared the explosion a terror attack
Putin said he told the chief of Russia's main domestic security agency, the FSB, that agents who encounter resistance from terror suspects should "liquidate bandits on the spot".
This photo provided by the Information Centre of the Russian National Antiterrorism Committee shows the damage inside a supermarket after an explosion, in St. Petersburg, Russia, Thursday, Dec. 28, 2017.
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No-one has claimed responsibility for the explosion, which occurred at a branch of the Perekrestok supermarket chain in the city's north-west Kalininsky district.
Putin called the bombing an act of terrorism. The shrapnel that was part of the explosive device proved the explosion "was a terror attack anyway".
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Mr Putin said the security situation in Russia would be much worse, however, if thousands of Russian citizens who had fought with the so-called Islamic State militant group in Syria had been allowed to return home.
Putin spoke Thursday at a military awards ceremony at the Kremlin but did not offer any details.
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I think as we head into the middle of next week, we could be seeing temperatures return into the low-mid 30s by Wednesday . Its potential is limited to a few snow showers or flurries, and the chance of measurable snow is just 20 percent.
He has previously said that over 4,000 citizens from Russian Federation and some 5,000 people from other ex-Soviet nations have joined the Islamic State group in Syria and Iraq.