A terror suspect and sex offender with 17 aliases was able to get a job at Britains busiest airport in an alarming security breach. Mohamed Abdullahi Mohamud, 31, who is said to be on an official terror watchlist and has a criminal record including robbery, assault, money laundering and threats to kill had made access to Heathrows runway in London. Airport bosses allegedly failed to carry out a full background check and he was handed a security pass and started work as a kitchen porter in a first-class lounge, according to the Daily Mail. A security source told the paper: How can somebody with a criminal past like this slip through the net? Even if he hadnt been a terror suspect his convictions should have meant he wasnt allowed anywhere near a plane – let alone our busiest airport. Mohamud is said to be known to the security services and has been interviewed five times in the past two years by anti-terror officers, it is claimed. He reportedly had two terror charges - relating to alleged hoaxes involving a harmful substance and a bomb - dropped due to insufficient evidence. He was convicted of sexual assault in 2015 and ordered to sign the sex offenders register for 10 years and in total has served five years in prison. Mohamud has been interviewed by a Governments anti-radicalisation programme, but he contacted a newspaper this week telling them he had been offered a job at an airport, boasting that no background checks were made and claimed he wanted to expose a security loophole. He took a picture of a plane from the runway to prove how close he got to the aircraft. Mohamud had lied about his criminal record to recruiters and took up the job through the SM Global Consultancy Ltd agency on Monday. On Tuesday he arrived at Heathrow and began work at the business and first-class lounge. Frighteningly, he spent five days at the airport and had airside access in Terminal 3, The Daily Mail reported. Around 17.7 million passengers pass through the terminal on 89,000 flights each year.