BAGHDAD—Iraq said Monday it has detained the mastermind behind a deadly 2016 bombing in a Baghdad shopping center, which killed around 300 people and wounded 250. The suicide car bombing in the central Karradah district was the deadliest attack by a single bomber in the Iraqi capital after the 2003 U.S.-led invasion that toppled Iraqi dictator Saddam Hussein. Two Iraqi intelligence officials said the man identified as Ghazwan al-Zobai, an Iraqi, was detained during a complex operation that was carried out with the cooperation of a neighboring country they did not name. He had been tracked by authorities for months. They told The Associated Press that al-Zobai was detained in an unidentified foreign country and transported to Iraq two days ago. They spoke on condition of anonymity because they were not authorized to speak of the operation on the record. The 29-year-old al-Zobai was an al-Qaida militant when he was …