A THUG has been jailed for a horrific “napalm” attack on another prisoner.

Peter Boath poured a mixture of boiling water and sugar over the victim in tough Shotts jail in July 2017.

The 41-year-old had been caught on CCTV heading to his target's cell clutching a kettle.

His fellow inmate was heard yelling in pain moments later.

The attack occurred in July last year while Boath and the victim, who was serving five years for violence, were in Shotts.

Read more: Scots teen dies on holiday in Benidorm

The hearing was told there had allegedly been a previous incident between the pair.

Prosecutor Lisa Gillespie said: “They saw [the victim] running from his cell completely naked. He was clearly in distress.”

He had to be transferred to a specialist burns unit for treatment to injuries to his face, neck, lips and chest.

Serial criminal Boath returned to the High Court in Glasgow on October 11 after he admitted attacking the prisoner to his severe injury.

Lord Burns sentenced Boath, who had been locked up 30 times before, to four years.

Read more: Fernando Ricksen hospitalised after Rangers fan event at Ibrox

But the latest jail-term will only begin after the thug serves a seven year stint for assault, abduction and robbery.

Boath will be monitored for a further three years whenever he is freed.