| This was the scene at the corner of Rue de L'Ecuyer |
A large police operation in the Belgian capital which lasted all afternoon was a false alarm, officials say.
| The police security cordon was taken down after several hours |
Christian De Coninck of Brussels police said officers could not take any risks: "This person was covered in plates, metal plates, or something that could be explosives.
"In the end it turned out to be a student. He was researching radiation and radioactivity in the city.
"The way he reacted was totally abnormal, which is why we had to use all these means," Mr De Coninck said.
The bomb squad was called, shops evacuated and several streets closed. The BBC's Gavin Lee in Brussels says police negotiated with the man for an hour before he was arrested.
Thirty-two people were killed in bomb attacks in Brussels earlier this year. Last month, a man was arrested amid an anti-terror operation at a shopping centre in the city. Prosecutors said he was wearing a fake suicide belt containing salt and biscuits.