So WHO ARE the Red Shirt Terrorists the answer is out
 

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Two M67 grenades found in pick-up truck of red-shirt guards

Two M67 grenades were found in a pick-up truck in a car park of Maneeya Building on Ploenchit Road near Rajprasong Friday, Khunying Pornthip Rojanasunant, director of the Central Institute of Forensic Science, said.

The pick-up truck has Sarabuir registration.

She said officials also found communication radios and an identification card of a red-shirt guard as well as an expired employee card of Sheraton Siam Thani Hotel. The employee card carries the name of Prasopchoke Watcharaparn.

The Nation