ISIS threatens attacks on major European cities

A group affiliated with the Islamic State released a new video on Monday threatening further attacks in the West, listing London, Berlin and Rome as possible targets.

The video, titled 'Fight them, Allah will punish them by your hands,' encourages extremists to 'kill [infidels] wherever you find them.'

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"If it was Paris yesterday, and today Brussels, Allah knows where it will be tomorrow," a narrator says in English. "Maybe it will be in London or Berlin or Rome."

The video includes footage of the aftermath of previous attacks. The group claimed responsibility for the recent bombings in Brussels that left 32 victims and three attackers dead. It was also reportedly behind the deadly November attacks in Paris that killed 137 people.

See images from the recent ISIS bombings in Brussels:

This is not the first time the extremist group has threatened to attack London. In February it promised a 'doomsday' attack which would "turn the hair of young children white."

The threat comes as the Islamic State suffers heavy military defeats in its own territory, which some terrorism experts say could be causing the group to lash out.

One expert told The Independent the group's message had become 'muddled', saying: "Its communication is in crisis. These indiscriminate attacks have fallen on multi-cultural cities with exactly the kind of Muslim populations they are trying to recruit."