Evidence that Britain's Counter Terrorist Unit has gathered reveals that many young children in the country are being brain-washed into hating non-Muslims and championing a holy war.
"No child is ever too young to be started off on Jihad training," states one document recovered by police from the North West's Counter Terrorist Unit (CTU) during raids.
CTU officers, interviewed by the BBC's Inside Out team for a special programme, show the document and a film they recovered of two children aged about three and six playing with a pistol and Kalashnikov rifle.
The CTU police say its discoveries, made separately, are evidence of attempts to radicalise youngsters, The Mirror reports.
The footage, which police believe was filmed in Pakistan, was uncovered on the hard drive of a suspect's computer, though investigators have not revealed when the material was seized.
The video shows a girl and young boy playing with guns, which police believe are real.
"What do you do with the weapon?" asks a man's voice. He answers his own question: "I want to kill the infidels [non-believers]."
A senior CTU officer said: "We believe this was filmed abroad. We have no idea who the children are. We were shocked to find it at the house. We have no reason to believe this is faked. The guns are real."