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Forensic expert Pornthip Rojjanasunant Monday called for an investigation into who ordered the purchases of explosive tear gas canisters, which were used in the crackdown on protesters last week.

Pornthip Chinese tear gas canisters used RDX explosives for ignition and thus they were considered weapons.

Pornthip, director of the Central Institute of Forensic Medicine, said other countries did not use tear gas canisters from China for crow control.

"The police who fired the tear gas canisters might not know that they were using bad things. But will anyone investigate who purchased these explosive canisters, which other countries do not use. They are considered weapons, not crowd control devices," Pornthip said.

The Nation