Toronto police have charged a second 15-year-old girl in connection with the videotaped beating of a 35-year-old woman on a downtown sidewalk.

The second arrest comes just hours after another 15-year-old girl was charged with assault causing bodily harm after video of the attack by three females was posted online.

The arrests come after the video was reported by media and classmates outed at least one of the suspected attackers on social-networking websites.

The attack occurred on a Yonge Street sidewalk, just south of Dundas Street, sometime between Saturday at 11 p.m. and Sunday at 1 a.m. Police began investigating the incident Monday after someone contacted them about the video, which was posted on at least two websites.

In the video, the beating victim told her attackers she was pregnant but police said the 35-year-old woman, who was identified and interviewed by officers, is not pregnant and wasn't pregnant at the time of the assault.

Police said the victim suffered serious but non life-threatening injuries.

The video begins with an argument between the woman and younger women in front of a fast-food restaurant.

Before the attack, the victim claimed to be pregnant. One of the young women replied, asking: "You're pregnant and you're trying to fight b----es?"

The suspects told the victim, who is repeatedly called a "crackhead," to walk away but a man in the group urged the suspects to punch her in the face.

After trading insults, the confrontation escalated to the point where the victim swung her jacket at the group and knocked a bottle of alcohol out of a young woman's hands, causing it to shatter on the sidewalk.

After that, the enraged suspects swarmed the victim and began slapping and punching her before she was knocked to the ground and repeatedly punched, kicked and stomped about the body as she screamed in pain.

As the attack ended, the woman was spat on by a female suspect. A bystander came to the woman's side to comfort her as the video clip ended.

The three-minute clip surfaced online Sunday and police began their investigation Monday.

@ChrisKitching is on Twitter