A nine-year-old boy has died after he became trapped underneath a school locker, police said.

The child, who was not a pupil, had been with family members at the swimming pool at Great Baddow High School in Chelmsford, Essex.

He died in hospital following the incident during an after-school club on Thursday evening.

An Essex Police spokesman said: "We were called by the ambulance service at about 6.15pm on 23 May to reports a child had been injured at Great Baddow High School in Duffield Road, Chelmsford.

"The nine-year-old boy was believed to have fallen from a locker and become trapped underneath it.

"He was taken to hospital, where he sadly died.

"We are liaising with the Health and Safety Executive.

"The child was not a pupil at the school and had been there with family members at an after-school club."

An air ambulance landed at the school but the boy was taken by land ambulance to Broomfield Hospital in Chelmsford, the East of England Ambulance Service said.

A statement on the school's website said it is closed on Friday "due to exceptional circumstances" except for Year 11 and Year 13 students sitting exams.