Under sixteens are kept overnight in police cells more than 50,000 times every year in Britain.
A Freedom of Information Request by the Howard League for Penal Reform has found that over 2 years, 13,000 aged 9 to 13 were detained overnight by police and another 40,000 aged 14 and 15.
But only half the 43 police forces supplied information and figures for London are not included.
Channel 4 News Home Affairs Correspondent Simon Israel reports on plans to reduce the figures.