Police have launched an online “whodunnit?” video to teach teenagers in Lambeth how minimal involvement with a crime could see them charged with a serious offence.

The Who Killed Deon? Facebook and YouTube pages aim to inform young people about joint enterprise – the law by which multiple people can be found guilty of crimes, despite not having any direct involvement.

The law means those who lend encouragement and approval to a crime can be charged with the same offence as the chief perpetrator and could receive similar prisonsentences.

The online tool features six character films – each with a different connection to a murder and explanation whether that person was involved.

To watch the video visit facebook.com/ whokilleddeon.