Ariel Castro tells the court he understands he will never be released from prison under a plea agreement which means he will not be eligible for the death penalty.
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Staffordshire Police said the operation at the site of a former munition factory was ongoing.
The explosions at the site were supposed to build confidence ahead of a summit between Kim Jong Un and Trump, which has been cancelled.
The Oscar-winning actor is facing allegations from multiple women, according to CNN.