SEATTLE, WA (NBC) Disturbing video-tape shows the graphic beating of a teenage girl in Seattle's Metro bus tunnel, while uniformed security guards simply look on.
The trouble started above ground around 7 p.m. on January 28.
According to police reports, a group of teenagers approached a 15-year-old girl they knew inside Macy's.
The encounter turned antagonistic and moved on to the downtown Nordstrom.
The group of 10 teenagers allegedly surrounded the girl and gave her a bad time about what she was wearing.
According to police, one in the group threatened her by stating, "Bitch, I'll kill you."
The security camera video picks up the scene as the group of teenagers are seen heading into the Metro tunnel at the Westlake Station, apparently following the girl who had been threatened.
One of the girls in the group, a 15-year-old who attends McClure Middle School in Seattle, approaches and within a few seconds, without warning, she pushes the victim off the platform and into the bus lanes.
The video shows the two girls hitting each other for a few seconds.
Then, the scene gets vicious.
The young attacker punches the victim in the head and face 10 times.
"It looks like a very egregious assault, which in fact it was," said Sgt. John Urquhart of the King County Sheriff's Office, which is investigating the case along with Metro Transit Police. "The two were acquaintances, and there probably is some teenage stuff going on before the attack but it certainly doesn't warrant an assault like this by any stretch of the imagination."
The video clearly shows that all of this is taking place right in front of three security guards.