Police learned of the third homemade bomb at 10.30am on Saturday when Kham Rojkaew, who owns a low-price goods shop near the Clock Tower in Narathiwat downtown, called police. 
Kham said he heard the sound of an explosion and found a briefcase among the pillows and blankets in his shop, so he called police. 
Police found that the briefcase contained a digital watch that was wired to a fuse and dry alcohol. The bomb detonated but it failed to light the alcohol to cause a fire, police said. 
Pol Captain Pollawat Thepsorn, deputy chief of bomb disposal unit, said the timer on the digital watch was supposed to cause a circuit to generate heat and light the fuse, but this one was faulty.

Third Narathiwat fire bomb ‘a dud’, shop saved

Insurgents who carried out two simultaneous arson attacks in Narathiwat’s Muang district also planted a third explosive device that failed to ignite a fire, police said.