The attack on the Democracy Lovers Network community radio station which leases a space in a bottle recycling plant in tambon Lat Sawai of Lam Luk Ka district occurred at 3.30am, ASTV Manager online reported.
The radio station broadcasts on 105.25 MHz and is operated by hardline Pathum Thani red-shirt leader Ko Tee, who has disappeared after charges of lese majeste were levelled against him.
The devices caused damage to an air-conditioning unit and recycling material stored in front of the radio studio, police said.
Boonhome Sawangjit, 51, who lives next to the plant, told police she was standing in front of her home at about 3.20am when 10 men on five motorcycles arrived in the factory compound.
She asked them where they were going, prompting two men on a motorcycle to approach her. The pillion rider pulled a gun, pointed at her and said “If you don’t want to die, stay put.” She then heard three explosions shortly after. Ms Boonhome alerted the plant employees after the attackers sped away.
Pol Col Naradej Tipparak, chief of Khukhod police station, said the assailants may have been targeting the radio station’s antenna to interrupt broadcasts, but missed it. The motive of the attack appeared to be political but may have been the work of a third-hand group angered by Ko Tee’s political activities, he added.