text: Steven Abberley caused a major security alert by throwing marbles at MPs and shouting 'you are all just liars' during Prime Minister's Questions . A protester who caused a major security alert by throwing marbles at MPs and shouting 'you are all just liars' during Prime Minister's Questions has walked free from court. Steven Abberley, 28, hurled a tirade of abuse at politicians during a session in the House of Commons in October last year. He then threw the glass balls from the public gallery, but they missed MPs and hit a security screen. Abberley excused himself to fellow observers before shouting 'you are all just liars' at Prime Minister David Cameron and the rest of the chamber during the televised Parliamentary debate. When arrested, Abberley told police officers that he had daubed the words 'the enemy within' in red paint on the palace's walls, Westminster Magistrates' Court was told. Prosecutor Mavis Ramkissoon said the incident happened five minutes before the end of the weekly question-and-answer session. She said: 'Without warning at 12.25pm, Mr Abberley stood up and began to shout, "I'm sorry about this ladies and gentlemen". 'Mr Abberley's arms were outstretched, he said: "you f***ing w*****s, you are just liars".' Abberley, who is unemployed, then interjected from the dock, telling the court: 'Can I just say for the record I didn't call anyone "f***ing w*****s". I called them "dishonourable b******s".' Ms Ramkissoon continued: 'He produced a cloth bag and threw the contents of the bag at the security screen, causing a loud bang.' The prosecutor said there was no damage to the screen, but the marbles scattered causing 'distress and shock' to the people in the gallery. 'When he was arrested, Abberley made admissions to the arresting officer concerning criminal damage to the Palace of Westminster', she said. Abberley had scrawled the words 'the enemy within' on the wall just outside the public gallery. Steven Abberley, pictured with his mother, hurled a tirade of abuse at politicians during a session in the House of Commons in October last year . Abberley threw the glass balls from the public gallery during Prime Minister's Questions, but they missed MPs and hit a security screen (file picture) There is no footage of Abberley spray painting the wall, and the judge said he would not have been caught if he had not told the police what he had done. Ms Ramkissoon said it cost £2,416 to remove the graffiti. The court heard that Abberley, whose mother was in court today, is taking medication for mental health and a behavioural disorder. He said that he is looking for a job, and is hoping to join the Army. Abberley, from Carshalton, south London, admitted one count of criminal damage and one of threatening behaviour. District Judge Quentin Purdy sentenced him to eight weeks in prison for throwing the marbles and four weeks for the graffiti, but suspended both jail terms. 'Your personal view of politicians, whatever they may be, are entirely a matter for you,' he said. The unemployed 28-year-old was given suspended sentences for criminal damage and threatening behaviour . 'But the difficult you have is how you chose to express it, by criminal damage and your antics in the gallery at the House of Commons. 'People are entitled to go to that place and listen calmly to that said below. You chose to disrupt them.' The judge said Abberley had caused 'disquiet' which may force others to think again about attending Parliament. 'Those that cause disruption at the Palace of Westminster have a knock-on effect to other freedoms and confidence in going that, and that must be actively deterred.' The sentences will run concurrently and Abberley has been ordered to pay back £500 in compensation at a rate of £5 a fortnight. He will also undergo supervision sessions for two years, mental health treatment for the next year, and pay an £80 victim surcharge.
target: Steven Abberley threw marbles during PMQs but they hit a security screen .
  He stood up and shouted 'you are all just liars' before the bizarre attack .
  Abberley, 28, also spray painted graffiti on a wall outside the public gallery .
  He was given suspended sentences for threatening behaviour and criminal damage .