A boy and a girl from from the same year group have died on the same day in two separate incidents.
The two Year Nine pupils at Horndean Technology College both died last Monday, the headteacher said.
One of the children, a 14-year-old boy, was a pedestrian killed in a crash with a car which was towing a trailer.
The driver was arrested on suspicion of driving while unfit through drugs.
The second child, a 14-year-old girl, died at an address in Waterlooville.
Police said the death is not being treated as suspicious.
The school in Hampshire confirmed both incidents happened away from the school site, The Sun reported.
Headteacher Julie Summerfield told parents: ‘Both students were valued members of HTC, and we will all miss them greatly.
‘Our thoughts are with their families and friends, and they are receiving appropriate support.
‘We have shared the news with our students.
‘We understand that families will want to support their children through this extremely difficult time and below we have provided some links to useful resources to help in conversations.’
A 24-year-old man from Waterlooville was arrested in relation to the crash.
He was released pending inquiries.
A spokesperson for Hampshire Police said: ‘We were called at 9.10pm on 7 July to a report of a sudden death of a 14-year-old girl at an address Waterlooville.
‘This is not being treated as suspicious and a file is being prepared for the coroner.’
