Officers from Provincial Police Region 7 inspected and collected evidence on Phetkasem Road, in front of Thammarat market in Bang Sapan district's Thong Mongkol subdistrict where rubber protesters clashed with crowd control police.
Many fragments of 'ping pong bombs,' energy drink bottles with chemical substances, burnt bicycle inner tubes and collected stones.
Police said 22 people were injured in the clashes, including police. 12 protest leaders were detained for questioning at the 14th Border Patrol Police Division in the provincial seat.
Two reporters cars were torched at the scene.
The protesters dispersed at around 2am this morning.
Meanwhile, Deputy Prime Minister Pracha Prommok led Deputy Prime Minister/Finance Minister Kittiratt Na- Ranong and Deputy Prime Minister/Agriculture Minister Yukol Limlaemthong to Nakhon Si Thammarat for talks with the protesters.
Pol Gen Pracha, assigned by Prime Minister Yingluck Shinawatra to negotiate with the rubber farmers to end the protest, said he did not expect the problems could end immediately.
However, he believed a proposal that could satisfy the rubber planters while being acceptable to the government could be the best solution to ease the problem.