President Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE in a call with Russian President Vladimir Putin Vladimir Vladimirovich PutinUS must demand equal access to Russian airwaves Why Moscow is quiet on the Israel-UAE peace deal Foreign-policy sleepwalking: Wake up to Germany no longer being such a good ally MORE late Monday offered Russia “the full support” of the United States in investigating a terrorist attack in St. Petersburg.

“President Trump offered the full support of the United States Government in responding to the attack and bringing those responsible to justice,” the White House said. “Both President Trump and President Putin agreed that terrorism must be decisively and quickly defeated.”

Fourteen people were killed in a suspected terrorist bombing inside a subway train Monday afternoon in St. Petersburg, Russia’s Tass News Agency reported.

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The office of Russia's prosecutor-general said authorities are treating the incident as terrorism.

Putin, who was in St. Petersburg at the time for a meeting with the president of Belarus, said officials “will do everything to find out the causes of what had happened.”

United Nations Ambassador Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE in a statement following the bombings said the U.S. “will stand with Russia on defeating these extremists who continue to senselessly harm innocent people."

Read more from The Hill:

Suspected St. Petersburg bomber 'had Islamist links'