A "violent" prisoner with gang affiliations who is due for deportation is on the run for the second time in a week, Sky News understands. 

Police are hunting for Daniel Boakye after he escaped from police custody in a hospital in Lewisham, south London.

Boakye, 21, had been serving time at HMP Feltham for robbery charges. He is understood to be violent, has gang connections, and is due for deportation to Ghana.

He had already gone missing after freeing himself from prison custody at West Middlesex University Hospital in the early hours of 10 February.

The prison service said at the time they were "urgently" working with the Metropolitan Police, and were investigating how he was able to escape from hospital.

Officers located him at an address in Thamesmead, southeast London, on Wednesday afternoon.

On Sunday, Boakye again absconded from policy custody, this time at Lewisham Hospital, where he had been receiving medical treatment.

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Police are now appealing for information to help them find him.

"Officers gave chase, but could not detail Boakye before he left the building," a Metropolitan Police spokesperson told Sky News.

"He is 21 years old, black, of medium height and slim build. He was wearing grey tracksuit bottoms, and a dark Nike jacket, when he absconded."