The unexplained increase in the number of Muslims in prison is a "worrying" trend and potential source of "social division", a landmark report into racism in criminal justice has said.

Labour MP David Lammy said the lack of data meant the fact the Muslim prison population had risen almost a 50 percent in a decade was unexplained, adding: "The lack of transparency undermines accountability."

The Muslim prison population is now 13,200. It means Muslims are 15 percent of all prisoners but five percent of the British population.

In his report on race disparity in the criminal justice system, Lammy notes courts and prosecutors don't record defendants' religion and said this made it impossible to answer why the Muslim population had surged.

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