A high-security prison has become "like an airport" with so many drones flying in drugs, inspectors have said.
Inmates were burning holes in cell windows to allow the drones in at HMP Garth near Leyland, Lancashire and stealing mops and brooms to use their handles to collect drugs from drones.
The report by the HM Inspectorate of Prisons found that the jail was "facing major security issues" with a 45% increase in violence with many inmates needing protection because of drug debts.
The Ministry of Justice said it had "zero tolerance" towards violence and drugs.