Birmingham bus stabbing: Police appeal for witnesses
7 March 2013 Last updated at 11:48 GMT
Police have appealed for witnesses to come forward following the stabbing of a 16-year-old girl on a bus during rush hour on one of Birmingham's busiest roads.
They have now launched a hunt for a black male in his late teens or early 20s. A suspect who was detained earlier has now been released.
Officers believe the teenage victim was on her way to school.
Det Supt Richard Baker from West Midlands Police gave a briefing to the media.