The Saudi government is accused of helping five students studying in Oregon flee the U.S. after they were charged or convicted of serious crimes including manslaughter, rape and possession of child porn.

The latest student, Abdulrahman Semeer Noorah, 23, is believed to have fled on a private jet with the help of his country's consulate in June last year just weeks before he was due to stand trial for killing a 15-year-old girl.

Noorah's case made international headlines last month following uproar over the killing of U.S.-based Saudi journalist, Jamal Khashoggi, who was murdered inside the country's consulate in Istanbul in October.

An investigation by The Oregonian has since revealed that four other Saudi students, who were studying in Oregon and facing similar circumstances to Noorah, have also fled the U.S. in recent years. All were young men studying at one of Oregon's public colleges or universities with assistance from the Kingdom of Saudi Arabia.

Officials revealed in December that they were working to get Noorah extradited back to the U.S. after he removed his court-ordered ankle monitor and supposedly used an illegal passport to flee the country.

Noorah vanished just two weeks before he was due to stand trial on manslaughter charges for killing 15-year-old Fallon Smart with his car when she was crossing a road in Portland in August 2016.

Abdulrahman Semeer Noorah is believed to have fled on a jet with the help of the Saudi consulate in June just weeks before his manslaughter trial was starting over the hit-and-run death of 15-year-old Fallon Smart in Portland in 2016

Courtesy of KOIN

The Saudi government only recently informed U.S. authorities that Noorah, who was a Portland Community College student, had returned to Saudi Arabia seven days after he went missing.

Noorah had been released from jail at the time on a $100,000 bond that the Saudi consulate paid. He vanished after being picked up from his college campus in a black SUV.

Now it has emerged that his was not an isolated case, with four other men also fleeing either before or after their cases went to court.

Suliman Ali Algwaiz

Portland State University student Suliman Ali Algwaiz was arrested in August 2016 after he drunkenly struck a homeless man with his car.

He fled the scene but was later sentenced to 90 days in jail.

Algwaiz was serving his sentence at weekends, but vanished before completing the 90 days and a warrant for his arrest is still outstanding.

Waleed Ali Alharthi

Waleed Ali Alharthi, who was an Oregon State University student, was found in possession of child porn in April 2015.

Police found pornographic videos on his laptop involving children. He was arrested and booked on 10 counts of encouraging child sex abuse.

The consulate also put up the security deposit for his $500,000 bail.

Alharthi attended multiple court hearings related to his case but failed to attend a status check in April 2015.

His lawyer told the court that she feared he was dead but authorities learned he had flown from Mexico City to Paris the week before.

Portland State University student Suliman Ali Algwaiz (left) was arrested in August 2016 after he drunkenly struck a homeless man with his car. Waleed Ali Alharthi (right), who was an Oregon State University student, was found in possession of child porn in April 2015

Abdulaziz Al Duways

In a similar case a few years prior, Abdulaziz Al Duways was arrested in December 2014 over the rape of a female classmate at Western Oregon University.

Arrest affidavits related to his case show that the alleged victim accused Al Duways of giving her marijuana and whiskey shots prior to the attack.

She called 911 during the alleged attack and when police arrived they found her crying in his bed.

Al Duways had allegedly told her: 'Tell them I'm your girlfriend' and 'I'll give you anything. I'll do anything if you don't tell them'.

He was charged with rape and held on a $500,000 bond. Days later, a Saudi consulate official paid his bond and Al Duways vanished before he faced court.

Ali Hussain Alhamoud

In 2012, Oregon State University student Ali Hussain Alhamoud was charged with raping a young woman.

He was released on bail, which the Saudi government posted, and he flew back to Saudi Arabia that same day.

Abdulaziz Al Duways (left) was arrested in December 2014 over the rape of a female classmate at Western Oregon University. In 2012, Oregon State University student Ali Hussain Alhamoud (right) was charged with raping a young woman

The first four cases were all represented by the same attorney, Ginger Mooney. She has represented at least nine Saudi students since 2014.

Mooney declined to comment in relation to the Oregonian investigation but her attorney said any suggestion of unethical or improper conduct by her client was 'completely unfounded'.

When the case involving Noorah came to light last year, Oregon senator Ron Wyden urged the U.S. government to investigate and to take action.

'These are shocking claims in any event, but with the barbaric murder of US resident Jamal Khashoggi, they suggest a brazen pattern of disregard for the law and abuse of diplomatic privileges,' Wyden wrote.

'If they are accurate, they would require significant restrictions on Saudi Arabia’s diplomatic privileges and call into question the future of America’s bilateral relationship with the Saudis.'

'Since the U.S. does not have an extradition treaty with Saudi Arabia, what steps is the Trump administration taking to ensure Mr. Noorah is accountable for the death of Ms Smart?'

He wanted a response from the State and Justice Departments by the end of January.