A man believed to be involved in the preparation of explosions used in the Brussels Airport bombing was killed after detonating one of those devices during the attack, police said. 

Najim Laachraoui, 24, was originally believed to be on the loose by Belgian authorities, The Washington Post reports. Belgian media initially reported that Laachraoui was arrested Wednesday, but those reports were later retracted. 

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His DNA was reportedly found on one of the bombs used in the deadly attacks in Paris last year, authorities told the Post. 

Another attacker, Ibrahim el-Bakraoui, 29 was also killed in the blast.

A third man seen leaving a bomb in airport surveillance footage remains at large, according to authorities.