ISIS has claimed responsibility for the London terror attack, according to reports.

The group’s official Amaq news agency has announced that a “detachment” was behind Friday’s explosion on a packed subway train.

“The bombing of the IED in the London tube was carried out by a unit affiliated to the Islamic State,” the agency said, according to the Independent.

The group cited security sources, though terror analysts warned that the claim could be a ruse.

Shiraz Maher, an expert on radicalization at Kings College London, told the Independent it was unusual for ISIS to claim responsibility while a suspect was still at large.

He called Friday’s declaration a “break from the norm” and “significant.”

According to the SITE Intelligence Group, the use of the term “detachment” is typically used to describe an ISIS attacker or “soldier.”

SITE director Rita Katz said supporters were spreading news of the attack online Friday.

“Europe bros turning up,” wrote one sympathizer, who Katz screenshotted.

“Good to hear MashaAllah,” they added, referencing the Arabic phrase meaning “God has willed it.”

While no one was killed, at least 29 people were hurt in Friday’s blast.

Scotland Yard has been treating the incident as an act of terrorism, but have yet to find the person responsible. Authorities do, however, know the identity of the attacker.