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Police are investigating this vile footage of bullies giggling as they carry out an horrific attack on a younger boy.

The victim, believed to be aged around 13, begs for mercy shouting "please, please" as he is kicked, punched and stamped on by two much bigger thugs.

Sickening thuds can be heard as the two Asian teens land blows on the boy's face in the footage posted on Facebook.

The person filming the incident on a mobile phone laughs and shouts "go, go" as they chase the victim down an alleyway.

In desperation, the young lad jumps into a garden and desperately bangs on a window for help.

But one of the bullies catches him and continues to kick and punch him in the head as he cries on the floor.

The 40-second clip has been brought to the attention of West Yorkshire Police after it was shared widely on Facebook.

It is believed to have taken place in Bradford.

The teen who appears to have posted the video on Facebook captioned it simply "hahaha".

When asked who the victim is, he replies "some mates. And some cheko".

A police spokesman for said: "We've been made aware of the video and its content and we are investigating."

Anyone with information should call West Yorkshire Police on 101.