BANGKOK, March 15 (TNA) – Police on Monday detained a suspect in connection with the firing of six M79 grenades into an army unit in Bangkok wounding two soldiers, but later released him after forensics tests established no link between the man and the grenade incident.

The authorities located a vehicle suspected of involvement in the grenade attack at the First Infantry Regiment on Vibhavadi Rangsit Road on Monday afternoon when a surveillance camera of the Department of Highways captured the footage of a suspicious vehicle passing by.

The suspect, named Nawin Duangsanit, 39, was questioned at Tungmahamek police station but was released later.

He said he was only driver, the owner of the car was deceased.

Dr Pornthip Rojanasunand, director of the Forensic Science Institute, the Thai Ministry of Justice who led her team jointly inspected the car with police team said the team found no any substance related to the bomb or trace of gun powder at his body and in the car.

The police released him and allowed him to reclaim the vehicle.

Acting Government Spokesman Panitan Wattanayagorn said Prime Minister Abhisit Vejjajiva was informed about the incident and ordered security to be tightened and the investigation to be accelerated.

So far, there is no solid evidence to identify which group carried out the attack, Dr Panitan said.

The grenade attack at the military unit occurred as the Red Shirt United Front for Democracy against Dictatorship (UDD) intensified their campaign to pressure the government after their gathering outside the 11th Infantry Regiment failed to force the government to dissolve the House.

Red Shirt leader and opposition Puea Thai party member of parliament Jatuporn Prompan denied UDD involvement in the incident, saying the state officials want to create situation leading to Emergency Decree enforcement.

The Red Shirt movement has planned to take three million cc of blood from the 100,000 demonstrators themselves to pour at all gates of Government House. The blood donation campaign is set to start at 8am Tuesday.

Dr Panitan said Mr Abhisit also instructed the Ministry of Public Heath to explain to the demonstrators about how donating blood can negatively affect their health and asked public health officials to help them. (TNA)