Several people were taken to hospital Friday morning after pepper spray was released inside a downtown Montreal bus terminal.

Emergency crews rushed to the Berri-UQAM bus terminal shortly before 11 a.m., after people inside complained of a foul smell and irritation.

The bus terminal was evacuated, and six people were treated at the scene by paramedics. Four people were taken to hospital to be treated for eyes and throat irritation.

Urgences Sante spokesperson Bob Lamle told reporters that those taken to hospital were experiencing more severe effects of the pepper spray, including burning in the eyes and skin, or breathing problems.

“They were showing what are basically classic signs of pepper spray exposure,” Lamle said, but were conscious and able to speak with paramedics.

The bus station reopened hours later.

Montreal police spokesperson Francois Collard said that investigators are combing through video surveillance tapes and interviewing witnesses as they look for those responsible.

There have been unconfirmed reports that a man was seen carrying a can of pepper spray in the bus terminal.

In Quebec, people are allowed to possess pepper spray, however, it is illegal to use it on someone. Spraying the noxious substance on someone can lead to a charge of assault.

With files from CTV Montreal’s Natalie Nanowski