8 September 2010 Last updated at 07:08 ET

Police investigate fatal dyke crash at Midville

Police are investigating the cause of a crash in which a 16-year-old boy died in Lincolnshire.

Jack Brennan died when the car his mother Rachel Edwards was driving hit a pothole and swerved into a dyke at Midville, near Boston on 19 August.

Ms Edwards, who was six months pregnant at the time, escaped from the car.

She dived back down to save her two-year-old daughter, Isabella, but was unable to free her son Jack without letting go of the toddler.

Holiday trip

A spokeswoman for Lincolnshire Police said: "There is still lots of work to be done to establish what the circumstances were and what happened.

"We will look at the causes to see if anyone was responsible. That's not to say if someone was at fault there would be any further action - that would be up to the Crown Prosecution Service.

"They need to get to the point where they know what happened on that day and that's an ongoing thing."

Ms Edwards, 39, who is originally from Derbyshire, was driving the children from Essex to Mablethorpe, Lincolnshire, for a holiday with relatives.

Two of her son's friends were also in the car but managed to escape and go for help.

Ms Edwards and her daughter were treated for minor injuries and shock at Boston's Pilgrim Hospital.

Isabella then had further treatment at the Queen's Medical Centre in Nottingham.