Some 5.6 million methamphetamine tablets have been seized in Thai territory along Mekong River during a one-month, anti-drug mission, said a Thai navy official on Saturday.

The Thai navy's Mekong Riverine Unit (MRU) task forces, based at several stations along Mekong River in Nong Khai province, Bueng Kan province and Nakhon Phanom province, have seized about 5.6 million speed pills, between Oct. 1 and Oct. 30, according to MRU Commander Rear Adm. Charatkiat Chaiyaphan.

Those speed pills might otherwise have sold for over 3 billion baht (about 96 million U.S. dollars) in a blackmarket, Rear Adm. Charatkiat said.

In addition, 248 kilograms of heroin have been smuggled across the river and seized in Thai territory by the MRU, he said.

Navy chief Adm. Chatchai Srivorakhan on Saturday visited the MRU headquarters in Nakhon Phanom and was briefed on the MRU's anti-drug mission.