Two teenagers remain in a critical condition and 14 people have been arrested following a mass brawl outside a college.
Roads have been closed around the college
Two 18-year-old men were stabbed during the fight outside Havering College in Hornchurch, east London, on Monday afternoon.
A third 18-year-old was also stabbed and is in a stable condition.
The ages of those arrested range from late teens to over 40, according to the Metropolitan Police.
Knives were recovered by police near the scene of the fight, officers said.
Detectives are investigating whether current or former students of the college were involved in the brawl on Ardleigh Green Road.
Roads have been closed and a forensic examination of the scene is under way.
Officers say it is not being treated as a racially motivated incident and they are keeping an open mind as to why the fight started.
The college has about 14,000 students and offers a range of further and higher education courses.
Havering College confirmed that one of the victims is a student there.