A 15-year-old boy has been arrested and is facing numerous charges in connection to a string of sex assaults in the Bloor and Christie area since August.

Toronto police held a news conference on Monday morning to provide the details in what they were calling a major announcement.

The teen was denied bail when he made an appearance in court later in the day on Monday.

Police say the assaults occurred in the geographical area bounded by Barton Avenue to the north, Ossington Avenue to the west, Palmerston Avenue to the east, and College Street to the south. In all cases, the accused approached women from behind, sexually assaulted them, then fled the scene.

Police say the latest incident happened on Saturday at approximately 11 p.m., when a woman was walking in the Roxton Road and Bloor Street West area was approached from behind and was sexually assaulted. He was arrested a short time later by police at the scene.

Toronto Police Chief Bill Blair admitted that undercover officers were used to try and nab the suspect.

"We also had women in our service who put themselves out in harms way and they were supported by other police officers from 14 division and from our specialized units and as a consequence of that another assault took place on Saturday night and an arrest was made."

The teen has been charged with 14 counts of Sexual Assault and two counts of Criminal Harassment.

His name cannot be released under the provisions of the Youth Criminal Justice Act.