Two men have been jailed for using drones to deliver contraband to inmates in prisons in Hertfordshire, Suffolk and Kent.
24 year-old Remo White-Channer and 24 year-old Romaine Gayle were jailed for six and four years respectively for their part in the operation.
Their sentence is the longest handed out in relation to drone crime say Hertfordshire police.
The pair pleaded guilty to using drones to deliver Class A and B drugs and mobile phones into three prisons including two in the eastern region; Highpoint in Suffolk, and HMP The Mount in Bovington near Hemel Hempstead.
It happened during the summer of 2016 and police say the estimated total value of contraband flown into the prisons is £48,000.
Prison officers were alerted when a drone crashed onto the roof at HMP The Mount.
Months of painstaking investigative work by detectives saw White-Channer and Gayle arrested in August 2016 after they were forensically linked to the crime.