
The daring operation is said to have occurred in 2014 when the small remote-controlled drone delivered 1,997 Captigon narcotic pills and 115 grams of hashish into the Briman Prison in Jeddah.
The drone landed on the roofs of barracks No. 7 and 8 at the prison after being controlled from a nearby supermarket by two brothers of the leader, The Saudi Gazette reported.
Once inside the jail, a prisoner would have turned salesman and transferred the proceeds to a bank account while other prisoners would have retrieved the drone from the roof.

The Saudi Arabia attorney general had objected in the Summary Court in Jeddah to the jail sentence - considering it to be extremely light and called for capital punishment for the main defendant.
The unnamed leader had already served 15 years in jail for drug trafficking previously.

Seven other accomplices in the operation were sentenced to prison terms of between three and 10 years.
More than SR200,000 (£40,000) in cash was found with the gang, an intelligence report had revealed.
It was reported that two prison guards accused of facilitating the entry of the drugs were acquitted.