Playing field petrol bomb blast in Northamptonshire
A petrol bomb thrown over a hedge on to a Northamptonshire school playing field landed near pupils having a PE lesson.
Four teenagers were later arrested and have been released on bail pending further inquiries in to the incident at Danetre School in Daventry.
Police are appealing for witnesses or information following the incident which took place on Friday 20 May.
No one was injured in the explosion, which left an area of grass 2m (6ft 6in) wide scorched.
Three 16-year-olds boys and a 17-year-old youth were arrested and questioned.
Sgt Sam Dobbs said: "I would ask that anyone who witnessed a group of youths in the area, or who has any information which might help the investigation, to come forward.
"This was a reckless act which we are taking very seriously.
"If the bomb had landed just two or three metres nearer to the children then someone could have been badly hurt.
"Whilst we take all reports of anti-social behaviour seriously, this reckless and shameful behaviour can in no way be described as high jinks.
"I am sure that Daventry residents will be as shocked as I am by this and I urge anyone who has any information which could help us to come forward."