The Campaign Against Arms Trade says UK fighter jets and bombs sent to the Gulf state have been used in the conflict in Yemen in which thousands have died.
The Government has been accused in the High Court of unlawfully failing to suspend the sale of UK arms to Saudi Arabia, despite evidence that the Gulf state is guilty of “repeated and serious breaches” of international humanitarian law.
The accusation is being made before two judges in London by the Campaign Against Arms Trade (CAAT).
CAAT says over 10,000 people have been killed as a Saudi Arabia-led coalition intervenes in the Yemeni civil war. It says UK fighter jets and bombs sent to the Gulf state have been used in the conflict.
It says the fighting has created a humanitarian catastrophe, destroying vital infrastructure and leaving 80% of the population in need of aid.
But the UK has continued to allow sales, with over £3.3 billion worth of arms having been licensed since the bombing began in March 2015.