Faruk and Babu were arrested in the afternoon, while the two others were arrested in the evening.
Acting on a tip-off, a police team raided a fishing boat on a canal in Chowfaldondi area around 1:00pm yesterday, said Mohammad Hasanuzzaman, superintendent of police (SP) of Cox s Bazar.
The police team recovered seven sacks of yaba tablets from the boat. There were around 14 lakh tablets in the seven sacks, said the SP.
A syndicate is involved with this huge consignment of yaba pills, the SP said, adding that it was one of the largest consignments recovered by law enforcement agencies in recent times.