Police have imposed a curfew in the Iraqi city of Najaf after a senior aide to Muqtada al-Sadr, an Shia leader, was shot dead near his home, Iraqi officials said.
Riyadh al-Nouri, who was the director of al-Sadr's office in Najaf, was killed as he drove home from Friday prayers in the nearby city of Kufa.
Police set up blockades, ordered..
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