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"The attack comes days after Norwegian prosecutors filed a terrorism charge against Mullah Krekar, founder of the Kurdish Islamist group Ansar al-Islam, who is accused of threatening a former minister, Erna Solberg, with death.

"Norway will pay a heavy price for my death," he said. "If, for example, Erna Solberg deports me and I die as a result, she will suffer the same fate."

It is not clear whether Friday's attack is related to the threat."