Acting on a tip off, the customs officials stopped four home-bound passengers -- Tawhin Murtaza of Naopara in Dinajpur, Abul Kalam of Siddirganj in Narayanganj, AKM Anwar Hossain of Tongibari in Munshiganj and Nazrul Islam of Brahamanbaria -- of Biman Bangladesh Airlines Flight No. BG-071.

As the officials checked their luggage, they recovered 554 mobile phone sets from their possessions.