The family of a teenager mauled to death by a pack of dogs have launched a petition for a change in the law after police said they were unlikely to prosecute anybody over the attack.

Jade Anderson,14, was alone at a friend's home in Chaucer Grove, Atherton, in England, on 26 March when she was attacked by four dogs - believed to be two bull mastiffs and two Staffordshire bull terriers.

A spokesman for Greater Manchester Police said last week they could not prove a crime had been committed.

They said they were unlikely to make a prosecution, although added that one may be brought in the future.

The dogs involved in the attack, which happened on private property, were not illegal breeds.

In response, Jade's family have begun an online petition calling for the law to be updated.

More than 400 people have supported the "Justice for Jade" petition.

The petition was set up by relative John Anderson, which will trigger a Commons debate if it reaches 100,000 signatures.

He believes dog owners should be made accountable for their dogs on private property, and urged for more regulation of "certain" breeds.

The petition says he wants to save other families from "suffering like we have".

Mother Shirley Lomas-Anderson told The Sun she was "furious" about the law restrictions.

The four dogs were later shot by police marksmen, while a fifth dog, which was not considered a danger to the public, was "contained" at the scene.