The Sri Lankan police investigating the deaths of at least 11 inmates in a prison riot in the country has said it will also probe the alleged excessive use of medicinal drugs by the prisoners that may have made them violent.

Sri Lanka prison riot killings: Use of medicinal drugs probed

One prisoner died in Sri Lanka as prison guards foiled an attempt by several inmates of a breakout, police said. Seven prisoners tried to escape from the penitentiary in Mahara on the outskirts of the capital Colombo, the police spokesman's office said, reported AP.

One prisoner dies in Sri Lanka after several attempt breakout

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Sri Lanka prison riot killings: Use of medicinal drugs probed

One prisoner dies in Sri Lanka after several attempt breakout