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(Image: AL-AMAQ)

Muhammad Riyad has been named as the 17-year-old Afghan refugee who left the busy commuter train looking like a "slaughterhouse" last night.

The horror unfolded on a train in Wuerzburg, southern Germany.

A statement released by al-Amaq earlier today said the attack was carried out "in response to calls to target nations in the coalition fighting the Islamic State".

The statement released on Twitter said: "Individual who carried out the axe attack in Germany was a soldier of the Islamic State who executed the operation in response to calls to target nations in the coalition fighting the Islamic State."

A hand painted ISIS flag was found at Riyad's home by Germany cops investigating the horrifying attack.

Cops have not confirmed the identity of the axe-wielding man – but have confirmed the assailant was a 17-year-old refugee from Afghanistan.

Riyad reportedly shouted "Allahu akbar" as he carried out the attack.

He was reportedly armed with a knife and an axe.

Around 150,000 migrants of the 1million who arrived last year in Germany are Afghans.