Toronto police are investigating after a female escort was violently sexually assaulted and robbed at the Quality Suites Toronto Airport hotel in Etobicoke early Tuesday morning.

Staff Insp. Mike Earl told reporters outside the hotel the 22-year-old woman opened her door to whom she thought was a client just before 5 a.m. when the robbery took place.

“The door burst open and three other males entered the apartment and pushed her back into the bathroom, at which time she was assaulted about the head,” Earl said, adding the men allegedly made demands for the woman’s cash, clothing, cellphone and credit cards.

After two of the male suspects allegedly sexually assaulted the woman, they threw her onto the bed and fled, Earl said.

The incident on the 12th floor of the hotel at 262 Carlingview Dr. is one of five robberies of its kind being investigated by Toronto police and officers across the city and the Greater Toronto Area.

Police believe female escorts advertising on the website Backpage are being targeted for the string of robberies, in which a male poses as a client before a group of men join him to rob the victim. The first case, Earl said, happened on Oct. 25 in the city’s west end, but other similar robberies have also occurred in the GTA.

“This is the first time that we’ve had such an incident where a sexual assault took place during the robbery itself,” Earl said.

Earl said two of the male suspects sexually assaulted the woman. All three men were described as being between 19 and 25 years old.

Forensic officers were on scene Tuesday, and officers were gathering video footage to help the investigation. Police believe there may be other victims and robberies tied to the investigation. Earl confirmed the suspects are still at large.