The Guardia Civil believe the group supplied the ecstasy which is believed to have been responsible for the fatal heart attack suffered by Jodie Nieman, a 20 year old British tourist, on July 13.
Mephedrone is a stimulant which has an increased heart rate among its side effects, and is sometimes sold as ecstasy.
The breakup of the British drug traffickers comes thanks to the work of the rural security section of the Guardia Civil on Ibiza
The EDOA anti organised crime and anti-drug group then took charge of the case leading to the location of the nine Britons, aged between 20 and 30, who lived in apartments in Sant Antoni de Portmany.
Their homes were searched last Wednesday afternoon when the arrests were also made. They will appear shortly in Instruction Court 2 in Ibiza.
