Abdulrahimzai was an experienced killer when arriving in UK
While claiming asylum to enter the country, authorities had no idea about Abdulrahimzai's gruesome history.
A year before killing Thomas he had gunned down two fellow Afghans with an AK-47 in Serbia.
The experienced killer pretended to be a 14-year-old schoolboy despite being 18 years old when he arrived in the UK.
Salisbury Crown Court heard during his trial he murdered two people in the summer of 2018 and had been convicted of drug offences in Italy in February 2017.
Prosecutor Nic Lobbenberg KC said: "Between July 31 and August 1 in 2018, during the evening in in Dobrinci… near the motorway, he murdered two people also from Afghanistan.
Mr Lobbenberg KC said Afghans were staying in a shed in the area when an argument broke out over trafficking.
“The defendant arrived and an argument broke about the business of transporting migrants.
“He was armed with an automatic assault rifle, two others had pistols… one of the group said ‘who is the smuggler?’ and then aimed their weapons at the victims
“He shot 18 rounds of a 7.62 calibre Kalashnikov.
“It’s a military weapon with great firepower and rapid rate of fire.
“The range of the shooting was said to be relatively short, three to 10 metres.”
In November 2020 he was convicted of murder in his absence by a Serbian court, having been wanted in the country since the attacks.
He was understood to be 15 at the time of the killings, it was heard.