Twenty people attending an anti-government rally at Uruphong intersection filed complaints with Phaya Thai police station on Sunday after velvet beans were dropped from an expressway onto the rally site, causing severe skin irritation and itching.
The group were accompanied by Nitithorn Lamlua, an adviser to the Network of Students and People for Reform of Thailand, which organises the rally, and more than 100 protesters.
Mr Nitithorn said an unidentified person or persons dropped the velvet beans (Mucuna pruriens), locally known as maa mui and known to cause extreme itching when they touch the skin, from the expressway at about 3.30am on Saturday. Twenty people were affected by the notorious plant and some were taken to hospital after they suffered a severe allergic reaction.
Pol Col Saman Rodkamnerd, the Phaya Thai police chief, said there were as many as 20 people wanting to file complaints and police would accept petitions from only seven of them first and gradually summon them for questioning.
The Traffic Police Division supervises the expressway, while the area underneath at Uruphong is the jurisdiction of Phaya Thai police station, he said.
The incident was the third attack on the group after it was hit with a Molotov cocktail and velvet beans on Oct 11 and Oct 16, Mr Nitithorn said, adding that he wanted police to find the culprits quickly.
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