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MOSCOW — A suicide bomber born in the Central Asia republic of Kyrgyzstan was behind the grisly attack on the St. Petersburg subway, Russian authorities said Tuesday as the death toll rose to 14.

Investigators said body parts of the suspect, Akbarzhon Jalilov, 22, were found in the third car of the mangled train.

His DNA was also found on a second, shrapnel-packed explosive device that was found at another station and safely defused, the country's Investigative Committee said in a statement.

The attack came as Vladimir Putin was visiting the city, his birthplace. A Kremlin spokesman said it was "noteworthy" that it coincided with the president's presence, but did not elaborate.

Eleven victims were killed at the scene, one died in an ambulance and two more at the hospital, Russia's health minister Veronika Skvortsova told reporters. Forty-nine wounded were still hospitalized, she said.

Russia is home to a large diaspora of Central Asian migrants who flee poverty and unemployment in their home countries for jobs in Russia.

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In the past two decades, Russian trains and planes have been frequent targets of terrorism, usually blamed on Chechen separatists or Islamic militants, but St. Petersburg — a major tourist destination famed for its imperial palaces and lavish art museums — had been spared previous attacks.

PHOTOS: Explosion Rocks Russian Subway

"From now on, I will be scared to take the subway," said Marina Ilyina, 30, who brought flowers to the station where the train stopped after the bombing. "We in St. Petersburg thought we wouldn't be touched by that."

Putin laid flowers to honor the victims overnight, according to official state news service TASS. The president stepped out of his car in Moskovsky Prospekt Avenue with a bunch of scarlet roses.

Vladimir Putin was in St. Petersburg at the time of the attack. STR / AFP - Getty Images

The blast happened when the train was between the Sennaya Ploschad and Tekhnologichesky Institute subway stations.The second device was found at Ploshchad Vosstaniya station. It was loaded with shrapnel and contained up to 2.2 pounds of explosives, Interfax reported.

There was praise for the train driver, who took the damaged cars forward so that victims could be treated more quickly by first responders. Alexander Kavernin, 50, told reporters Tuesday he heard the sound of a blast while his train was running, raised the alarm and carried on to the station.

"I had no time to think about fear at that moment," he said.

Jitters were underscored Tuesday as several stations were briefly closed amid fresh bomb threats.

In a phone call with Putin, President Donald Trump offered condolences, the White House said in a statement. Trump also pledged to support Russia's response to the attack and its pursuit of justice, the statement said.

"Both President Trump and President Putin agreed that terrorism must be decisively and quickly defeated," the statement said.

The explosion tore through a subway car at about 2:40 p.m. local time (7:30 a.m. ET) Monday. megapolisonline.ru HANDOUT / EPA

ISIS claimed it had created a bomb brought down a Russian MetroJet passenger jet over the Sinai desert in Egypt in 2015. The Dec. 25, 2016, crash of a Russian plane near Sochi that killed 92 people, including members of the Red Army Choir, is widely believed to have been due to a bomb, but no official cause has been given.

Previous attacks in Russia include the bombing of a Moscow-to-St. Petersburg train on Nov. 27, 2009 that left 26 dead and 100 injured.

On Jan. 24, 2011, a suicide bomber blew himself up at Moscow's Domodedovo Airport, killing 37 people and wounding 180. The same airport in August 2004 saw Islamic suicide bombers board two airplanes and bring them down, killing a total of 90 people.

Alastair Jamieson reported from London.