Spanish police have arrested six people and seized 16,000 marijuana plants hidden within pine forests in remote Aragon.

Officers made the startling discovery of plantations that would have produced 3,500 of cannabis, after tracking a gang of Albanian robbers deep into forests within two remote corners of the northeastern region.

Members of the gang were under surveillance after a spate of thefts from bars and petrol stations between Zaragoza and Huesca.

They led police to two massive plantations, one near Agüero in Huesca province and the other near Murillo de Gállego closer to Zaragoza which could only be reached by offroad vehicles on  a 30 minute track through the forest and a further half an hour walk along narrow paths.

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