Derbyshire Constabulary
Speaking from the site, Boris Johnson said it looked "dodgy but stable".
The Royal Air Force has joined efforts to stop Toddbrook reservoir from collapsing after flooding caused "extensive" damage.
Danger to life flood warnings follow damage to Toddbrook Reservoir.
The slider has been surrounded by four cones by Derbyshire Police.
Four people were injured in the incident outside Kirk Hallam Community Hall.
Witnesses say they heard they boy's mother shouting for help.
Police described the crime as 'absolutely horrific'.
Only one person in aircraft.
'We believe this was a tragic incident for everyone involved and their families.'