The Islamic State of Iraq and the Levant (ISIL), proscribed by the government as a terrorist organisation, has targeted Australian Muslims for recruitment. Making use of social media, recruiters target those vulnerable to radicalisation, and encourage local jihad activities. Some of those targeted have been minors, including a teenager who was arrested in Melbourne in May 2015 for plotting to detonate home-made bombs. In June 2014, the government claimed that roughly 150 Australians had been recruited to fight in the conflicts in Syria and Iraq. A list released in April 2015 showed that most were young males who have come from a range of occupations, including students. It was also reported at the time that 20 Australians had been killed fighting overseas for terror groups, with 249 suspected jihadists prevented from leaving Australia. The Border Force Counter-Terrorism Unit, tasked with stopping jihadists from leaving the country, had cancelled more than 100 passports by the end of March 2015. Several jihadists have expressed the desire to return to Australia, but Prime Minister Tony Abbott has said that any who do would be prosecuted on their arrival.