BANGKOK, July 17- A shipment of 158 pieces of contraband ivory with a street value of Bt22.8 million (some US$760,000) was seized at Thailand’s main international airport, according to a senior customs officer.

A quantity of elephant tusks, hidden in six suspicious wooden crates, was confiscated at a warehouse inside on Suvarnabhumi Airport July 13 after the authorities had been tipped off about ivory smuggling, Customs Department deputy director general Thanat Suwatthanamethakul told a press briefing on Tuesday.

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