Anti-government protests were organised in Bangkok on Tuesday morning and evening, including a violent rally at Din Daeng intersection, police said.
Pol Maj Gen Piya Tavichai, deputy commissioner of the Metropolitan Police Bureau, said a group of demonstrators called Ramkhamhaeng for Democracy gathered briefly at Government House at 10am and poured paint and littered there. Police arrested them for prosecution.
The second group of protesters led by Nattawut Saikuar blocked Asok intersection at 4pm and set up a stage for speakers.
At 5.10pm some protesters left the intersection on their vehicles and travelled on Sukhumvit Road via Phra Khanong intersection to Bang Na intersection. Then they returned on the same road to Asok intersection. The demonstration ended there at 7.10pm.
The Thalu Fah group staged their protest at the Democracy Monument at 4pm. Protesters hung banners on the monument and burnt things around it. The demonstration ended at 8pm.
The last group, Thalu Gas, gathered at Din Daeng intersection at 5.30pm. Demonstrators threw fireworks, ping pong bombs and pipe bombs at government offices and a hospital.
At 7.45pm police arrested 15 wrongdoers and seized a certain number of improvised explosive devices and weapons, Pol Maj Gen Piya said.
Demonstrators also set fire in many areas and their violent attacks continued at Din Daeng intersection. Pol Maj Gen Piya advised passers-by to take precaution and people who lived in the vicinity to return home before 9pm.