'Film me all you want' - teenage girls with no fear of police torment one High Street

She's refusing to leave a shop caught at the centre of a prolonged campaign of antisocial behaviour - windows smashed, items stolen, fires started, staff threatened and attacked.

Muhammad Usman, owner of the mobile phone store in Shirley, near Southampton, is filming her on his own phone - and her juvenile bravado is in full flow. "Touch me and I'll get you done for assault," she warns him.

"It's getting worse, day by day," Muhammad later tells us from behind his till. His voice cracks, clearly worn down by months of abuse - including, he says, a threat by a teenager to kill him. "I've never had this kind of experience in my life before. We're feeling so helpless."

What Muhammad and other shopkeepers have experienced over recent months captures the challenge antisocial behaviour poses to police, councils and communities at a time when the government has said tackling it is a key priority.

Three doors down, on the same High Street, Nnenna Okonkwo is also feeling under siege. "It's ridiculous that it's just a couple of teenagers causing this mayhem," she says through tears.

But these don't seem to be hooded gangsters armed with weapons.

When I eventually encounter the gang, I'm faced with a 14-year-old girl in pink leggings and Crocs.

"I'm not claiming to be innocent because I'm not," she tells us. "I've threatened people and I've hit people, I'll admit to that."

"The second you get into one bit of trouble with the police, you fall into it too deep and you can't get out," she adds.

She says an injury forced her to give up sport and that behaving badly offers an alternative energy release. "I found that I get the same adrenaline boost from being in trouble with the police and being missing and stuff."

But there's little remorse. "I regret what I do, but I don't say sorry," she says to cheers from the rest of the gang.

She seems bright but deeply troubled. She admits drinking and she's vaping while we talk. Muhammad had already told us he had experienced racist abuse - something the girl firmly denies being involved in.

One of her friends chimes in. "I know what we're doing is wrong but we're teenage kids, we're going to have a bit of fun," she tells us. "I'm sorry for most of the people we have damaged, but I have no sympathy… it's just one way of taking my anger out."