Terrorist group ISIS alone was responsible for the Crocus City Hall terror attack near Moscow, while there was no evidence that the Ukrainian government is linked to the shooting, White House press secretary Karine Jean-Pierre said in Washington DC on Monday.

"This was a terrorist attack that was conducted by ISIS. Mr. Putin understands that. He knows that very well. And look, it is there is absolutely no evidence that the government of Ukraine had anything to do with this attack. We've been very clear about that," Jean-Pierre said.

"ISIS bears the sole responsibility here," she added.

The spokesperson also highlighted that the US in early March shared intelligence with Russia regarding 'a planned terrorist attack in Moscow'.

"We made this clear on March 7th, and we even issued a public advisory to Americans in Russia for their awareness. She underscored that

Late on Friday, unidentified individuals dressed in military fatigues opened fire in the Crocus City Hall, a 6,000-seat multipurpose concert hall where a Russian rock band was set to perform. A massive fire broke out in the building shortly after.

According to the Russian Investigative Committee, the attack left 139 people dead, with 182 injured, at the time of publication.

The Russian Investigative Committee opened a criminal case under Article 205 of the Criminal Code of the Russian Federation ('Terrorism').

Russian President Vladimir Putin described the attack as a 'barbaric terrorist act' in a televised address on Saturday, adding that all four perpetrators of the terrorist attack at Crocus City Hall had been found and detained.

“They tried to hide and moved towards Ukraine, where, according to preliminary data, a window was prepared for them from the Ukrainian side to cross the state border,” Putin said.

Russia’s Federal Security Service (FSB) claims the attackers planned to cross the Russian-Ukrainian border and 'had relevant contacts on the Ukrainian side'.

In turn, the Russian Investigative Committee said that special services had detained four suspects in the Bryansk region, not far from the border with Ukraine.

The Ukrainian Foreign Ministry said it 'categorically denies' accusations of Kiev’s involvement in the shooting.

On Monday, Putin stated during a meeting that the attack was carried out by the hands of 'radical Islamists', but added that 'we want to know who ordered it'.

"We know that the crime was committed by the hands of radical Islamists, whose ideology the Islamic world itself has been fighting for centuries,” he stated.

The US and other Western countries attributed the attack to Afghan-based Islamic Sate affiliate ISIS-Khorasan, also known as 'Isis-K'.