A high-pitched device used to disperse teenagers is being challenged by campaigners, who say it is not a fair way to treat young people.

There are estimated to be 3,500 of the devices, known as the mosquito, in use across the country.

Their sound causes discomfort to young ears - but their frequency is above the normal hearing range of people over 25.

The Children's Commissioner for England says they should be scrapped as they infringe the rights of young people.

Negative views

The devices, which exploit the fact that a person's ability to hear high frequencies generally declines once they reach their 20s, have proved popular with councils and police who aim to tackle anti-social behaviour by using them to disperse groups of youths.

(Article continues below)

But a new campaign called "Buzz off", led by the Children's Commissioner for England and backed by groups including civil liberties group Liberty, is calling for them to be scrapped.

The organisations want to highlight what they call the "increasingly negative" way society views and deals with children and young people.

Sir Al Aynsley-Green, Children's Commissioner for England, said he had spoken to many young people who had been "deeply affected" by the deterrents.

He said: "These devices are indiscriminate and target all children and young people, including babies, regardless of whether they are behaving or misbehaving.

Full article here.