The 20-year-old former world junior champion clocked 44.48 seconds with a stunning late surge to finish behind gold medallist Wayde van Niekerk of South Africa (43.98 seconds) and silver medallist Steve Gardiner of the Bahamas (44.41 seconds).
“It was a great race with so many stars but I was confident of success,” Haroun said. “To win a medal at the World Championships for Qatar is a dream come true,” he added.
Two years ago, Haroun had won the gold medal at the Asian Championships in Wuhan, China, and a silver at the World Indoor Championships in Portland, USA.
There was drama before the race, however, as the IAAF barred in-form Botswanan Isaac Makwala from competing after he was diagnosed with an infectious disease and ordered to observe a 48-hour quarantine.
That did not stop Makwala trying to get into the stadium before being refused entry.
“The IAAF is very sorry that the hard work and talent of Isaac Makwala won’t be on display tonight but we have to think of the welfare of all athletes,” world athletics’ governing body said in a statement.
Makwala, third-fastest in the year this season, was scratched from the race earlier yesterday having also been withdrawn from Monday’s 200m heats after vomiting before he got on to the track.
He insisted he wanted to run but IAAF officials ruled him out and refused him entry to the stadium amid a swathe of nanovirus and gastroenteritis cases that have affected about 30 athletes from a selection of countries.
