A woman with a long history of anti-social behaviour lunged at a police officer with a knife sparking an hour-long stand off, a court heard.

Stacey Sadler, 21, was at her boyfriend's address in Rosary Road, in Norwich, when they refused a police officer entry and after initially holding the knife to her throat she lunged at the officer with the blade, Norwich Crown Court heard.

Lori Tucker, prosecuting, said the officer called for back-up and during the hour-long incident both Sadler and her boyfriend Martyn Smith, 32, who was also armed with a knife, made threats to officers until they both surrendered themselves up and the knives were recovered.

The stand-off was in May this year, but Ms Tucker said there was an earlier incident, in March, when Sadler made threats to her neighbours in Unthank Road, Norwich, that she would kill them and threatened to 'slice them up' before stabbing at their front door with a knife.

The court heard Sadler had long a history of anti-social behaviour, and in 2013 was made subject of a Conviction-Related Anti-Social Behaviour Order (crasbo), banning her from entering Holt for two years.

Sadler and Smith both admitted affray and Sadler admitted a further affray, criminal damage and assault.

Sadler was jailed two years and made subject to a restraining order not to contact her former neighbours and Smith was jailed 10 months.

Recorder Guy Ayers told Sadler: 'You are building up a very long history of anti-social behaviour, both to property and more particularly to people.'

He said while on bail, she had been involved in the second affray with Smith.

'You again armed yourself with a knife. I accept initially making threats to yourself, but as things progressed your anger and agitation was directed towards the police and you made a lunging, stabbing motion to one of the police officers.'

Andrew Oliver for Sadler, said at the time of the offences she was going through emotional turmoil.

'She had no intention to harm anyone.'

David Wilson, for Smith, said he was fearful his partner would come to harm: 'He accepts he handled the situation very badly.'