ISLAMABAD (AFP) - Pakistani and Belgian authorities have seized cocaine and hashish worth more than US$76 million (S$96 million) in a series of drug raids in which three foreigners were arrested, Islamabad said Friday.

A consignment of 3,000kg of hashish en route from Afghanistan to Belgium was impounded in a joint operation and 1,000kg of cocaine intercepted separately, the Pakistani government said.

It said the hashish was worth US$30 million and the cocaine US$46.5 million.

Opium poppy is widely grown on the Pakistan-Afghanistan border, a region infamous for Taliban and Al-Qaeda-linked strongholds.

Pakistan has a 2,500km porous border with Afghanistan, which supplies 90 per cent of the world's opium used to make heroin.