An inmate has been murdered at Wandsworth prison in England, police say.

Police were called to the jail in south London on Monday morning after receiving reports a male prisoner in his 60s had been found apparently dead in his cell.

Another prisoner in his 40s was arrested on suspicion of murder and remains in police custody.

Wandsworth is the largest prison in Britain and one of the biggest jails in Western Europe, able to hold some 1,800 prisoners.

Since 1989 there has been extensive refurbishment and modernisation of the wings, including in-cell sanitation and privacy screens for cells occupied by more than one prisoner.

But a report in 2011 branded conditions inside "demeaning", "unsafe" and "below what could be classed as decent".

A Prison Service spokeswoman said: "An HMP Wandsworth prisoner was pronounced dead in hospital at 8.52am on Monday 4 May. A police investigation is ongoing, so it would be inappropriate to comment further at this stage."