A sixteenth birthday party at a school hall was crashed by a group of youths with knives who stabbed two teenagers.
Three arrests have been made following the incident at Elm Park Primary School in Havering, Essex, yesterday evening.
Reports suggest as many as 50 young people were in the group that stormed the hall at around 9pm and kicked off fighting until 11pm.
A 19-year-old and a boy aged 16 were taken to hospital with non-life threatening injuries.