More than five tons of smuggled elephant tusks worth an estimated £6.4 million were crushed and burned today in the biggest known destruction of trafficked ivory outside Africa.

The Philippine government, which organised the destruction of the stockpile, gathered from seizures since 2009, said it demonstrates its commitment to fighting the illegal ivory trade.

It also eliminates any opportunity for corrupt officials to resell the ivory, as was the case in 2006 when the largest single shipment of 3.7 tones vanished from the inventory, according to an international network that tracks the illegal trade.

"Ivory is known to have disappeared from a number of government-held stockpiles worldwide, so it is vital that proper protocols are established," said Colman O Criodain from the World Wide Fund for Nature.

The US Agency for International Development and the anti-wildlife-trafficking Freeland Foundation said that they were assisting the Philippine government in conducting DNA analysis of elephant tusks at the Center for Conservation Biology of the University of Washington so that law enforcement agencies will have information on the origin and transit points of the smuggled ivory. It will also help to dismantle criminal syndicates responsible for poaching in Africa.

"This not only sends a message to wildlife traffickers that the Philippine government is taking firm action against the illegal ivory trade, but also takes a stand against corruption by burning their ivory stockpile so it cannot be stolen then sold into the black market," said Steven Galster, director of Bangkok-based Freeland Foundation.

The Southeast Asian nation has been used as a transit route between Africa and the rest of Asia. Ivory can fetch up to £1,300 per kilogram on the black market and more than £32,000 for an entire tusk.

The Elephant Trade Information System, which tracks the illegal trade on behalf of the 1989 Convention on International Trade in Endangered Species, says that the Philippines is among nine countries and territories identified as being most heavily implicated in the illegal trade. The others are Kenya, Tanzania, South Africa, Malaysia, Vietnam, Hong Kong, China and Thailand.

The Philippines is a transit point but also is known for its carving industry producing religious sculptures and artifacts.

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