Mine that produced Queen's diamond investigates claims of abuses by guards

Petra Diamonds already faces court action on similar grounds, as its contractors are accused of continued assaults on illegal miners

A Tanzanian mine that produced a flawless pink diamond for one of the Queen's favourite brooches is investigating claims that security personnel have shot and assaulted illegal miners.

New allegations come months after a lawsuit alleging serious" human rights abuses was filed against Petra Diamonds, the mine's British owner, in the high court in London.