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About twenty police officers combed the area looking for clues, but there was no other evidence to support initial suggestions that the bomb had been set off by a mobile phone or another remote sensing device. Monday marked the third such attack this year at this very location. Though police installed six closed-circuit cameras at the parking lot, it failed to deter the attack which authorities blame on Malay Muslim separatists.

Police officers have also admitted that not all the cameras, put up a year ago, were functioning properly.

The bomb, estimated to be about five kilograms, was tied to an allegedly stolen motorbike at the parking lot, police said.

Pol Lt-Colonel Wasant Rakchartpanich suffered injuries to his right arm, while Pol Lt Sathit Khunthong suffered flesh and head wounds from pieces of metal. Police said insurgents took advantage of a downpour to carry out the attack, an action that proved to be another setback for authorities who believe they have been making progress in containing the violence.