After a terrorist attack took the lives of at least 22 people and injured 59 more on Monday in Great Britain, the radical Islamic terror group vowed to keep striking.

“A chilling message on [the social messaging app] Telegram, from an ISIS-supporting group, Yaqeen Media, said vehicle attacks will take place in the U.K.,” the British news site Daily Express reported.

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“Today we fight you on our land, and tomorrow on your land, by Allah’s permission,” the message said, according to Daily Express. “Soon, the vehicle attacks will be witnessed on your streets, by Allah’s permission.”

On Monday evening, a suicide bomber detonated explosives that created the deadly chaos at Ariana Grande’s concert, just as the program was finishing.

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The Islamic State claimed responsibility.

Related: Prayers for Families and Victims at the Ariana Grande Concert

“One of the soldiers of the Caliphate was able to place an explosive device within a gathering of the Crusaders in the city of Manchester,” said a statement allegedly from ISIS.

Grande, a 23-year-old American singer, tweeted after the incident that she was feeling “broken.”

“The explosion coincided with the conclusion of a pop concert, which was attended by many young families and groups of children,” Prime Minister Theresa May of Britain said in a televised statement. “This attack stands out for its appalling, sickening cowardice — deliberately targeting innocent, defenseless children and young people who should have been enjoying one of the most memorable nights of their lives.”

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“A sick video has surfaced online showing an ISIS jihadist saying ‘this is only the beginning’ after the Manchester ‘terror attack,'” the U.K.’s Mirror Online reported. “In the unverified footage, a man wearing a mask and sitting in front of a black flag [is] making the ominous warning.”

Related: ‘We Will Be Judged by God’ for Actions Against Terror, Says Trump

The attack this week took place as President Donald Trump continues his first foreign trip and meets overseas with leaders of the Islamic, Jewish and Christian faiths.

“That goal is to meet history’s great test — to conquer extremism and vanquish the forces of terrorism,” Trump said Sunday while speaking in Saudi Arabia to leaders of dozens of Muslim nations.

“Terrorists do not worship God, they worship death,” Trump said. “If we do not act against this organized terror, then we know what will happen. Terrorism’s devastation of life will continue to spread.”