The son of a businessman who went missing in Sa Kaeo's Aranyaprathet district on Monday has appealed to police to trace his father's pickup truck after the vehicle featured in a TV news report.
Chaichana Mai-ngan, 67, vanished on Monday morning while driving to buy groceries from Rong Kluea market in his white Nissan Navara.
His son Suchart yesterday appealed to officers at Kabin Buri police station in Prachin Buri to ramp up their search for his father's vehicle.
TV Channel 7 reported on Tuesday night that the Nissan Navara was captured by surveillance cameras at a petrol station in Kabin Buri district. The footage was recorded on Monday, after the time of Mr Chaichana's disappearance.
"The vehicle seen in the footage was my father's for sure," Mr Suchart said.
Speaking after meeting police, Mr Suchart said his request to obtain information about the investigation was a complex process.
Police did not have the information presented in the news report, he added.
Mr Suchart also appealed to the public for details about the whereabouts of his father and his pickup.
Kabin Buri police chief Thaweesak Polkerd said investigators knew nothing about the location of Mr Chaichana's vehicle and the matter was only reported in the media.
Mr Suchart said he believed his father is still alive, adding he could have been abducted and put in one of two vehicles _ a white Toyota Fortuner and a white Ford _ seen following him from the market in the CCTV footage.
Five men in uniforms similar to those of civil servants were also seen acting suspiciously in the footage, he added.
Mr Suchart suggested the motive for the abduction could be linked to his father's business. Mr Chaichana is involved in the used clothing business and owns several restaurants in Rong Kluea market. He is also a key supporter of the anti-government People's Alliance for Democracy.
Sapsakul Mai-ngan, a daughter of Mr Chaichana, said earlier her father was engaged in a legal battle over a plot of land near the Thai-Cambodian border. He was also involved in various court cases with government officials and local figures in the province, she said.