From the very beginning, the two men looked suspicious. The skinny one walked weakly, dragging a trolley containing three bags. The other, despite his heavy build, looked tired carrying a rucksack on his shoulder. Both looked in a hurry. They wanted to get to their seats on board a Silk Air flight bound for Singapore.

However, the police, who had had them under surveillance since mid-March, did not want to let them go scot-free. No soone