Dhaka, Bangladesh (CNN) The grisly lynching of a 13-year-old boy accused of theft has triggered angry protests in Bangladesh, after footage of the killing went viral on social media.

The clip shows the victim, Samiul Alam Rajon, tied to a post and beaten with a metal rod, while his attackers laugh and jeer during the attack in Kumargaon, on the outskirts of Sylhet.

Footage of the lynching, recorded by one of the attackers, was widely viewed on social networks, prompting hundreds of angry protesters to take to the streets, demanding the killers be punished.

The victim's pleas for mercy, or just a glass of water, were ignored by his attackers during the ordeal Sunday. A vegetable vendor, he had been accused by the men of theft.

An autopsy at Sylhet Medical College Hospital revealed he died from severe head injuries, while his body bore scores of marks.

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