STM investigating after inspectors filmed punching woman during violent arrest

Montreal's public transit authority has launched an internal investigation after cellphone video was posted to social media showing two STM inspectors violently arresting a woman.

The video does not show what led up to the event in Jean-Talon Metro on Saturday, but instead starts with the two inspectors struggling to hold the young woman down.

One man sits on her legs, while the other appears to deliver multiple overhand punches to the prone woman's head with a closed fist.

The woman appears terrified. A few civilianscome to her aid, struggling to pull the inspectors off her or to pull her away from the inspectors. The inspectors struggle toget an effective grip on thewoman.

At one point, one of the inspector's arms is pulled offthe woman's neck by a civilian. That's when she appears to bite one of the inspectors, and he responds by punching her in the face.

In the last few seconds of the video, Montreal police are on the scene, finalizing the arrest.

Mayor Valrie Plante acknowledged the video on Twitter Monday,saying "these are disturbing images, and an investigation begins today to shed light on what happened."

STMsays woman refused to identify herself

In a statement published to its website Monday, the STM(Socit de transport de Montral) says the intervention began when inspectors stopped a woman they saw pass through the turnstiles without paying.

The alleged fare dodger refused to comply or identify herself, the STM says, and the discussion carried on for several minutes as "our employees triedto defuse the situation."

When the woman triesto flee toward the exit, the inspectors "go after her and physically intervene to immobilize her," the STM says.

During the arrest, the woman repeatedly bites the inspectors, causing injuries that required emergency treatment, the statement says.

The STM says itsinternal investigation will review the use of force. Inspectors are expected to apply force proportional to the degree of resistance and aggressiveness of the person, says the transit authority, noting it is a common guideline for police services in Canada.

"In this case, the person was aggressive, actively resisted and bit our employees to the point of drawing blood, refusing to release the bite," the statement says.

The woman has been charged with assault.

Union defends inspectors' actions

The inspectors' union, the Fraternit des constables et agents de la paix de la STM (CSN), says in a statement that the video may appear disturbing, but what is even more disturbing isthat "officers who have done their job are bitten three times to the point of drawing blood and must be hospitalized for doing their job."

The CSN says the inspectors attempted to de-escalatethe situation for 20 minutes before the altercation.

"The union strongly deplores the many messages conveyed on social media inviting the population to physically attack the peace officers and special constables of the STM," the statement says.

CBC Montreal spoke with a witness who asked to remain anonymous for fear that speaking out could affecttheir job. The witness did not see what led up to the event in Jean-Talon Metro, but was first alerted to the altercation by the sounds of screaming.

The witness saw the inspectors trying to get the woman's hands behind her back.

"When she was on the floor, he punched her. I am positive I saw that. I was shocked. He punched her several times in the face with his fist," the witness said. "She was scared."