Bangladesh, Sept. 9 -- has been exposed in Cyprus after a Danish undercover police officer posed as a contract killer and infiltrated an alleged plot to assassinate twin brothers vacationing on the Mediterranean island.

The investigation, details of which have emerged from proceedings before a Cypriot court, has revealed an elaborate chain involving encrypted communications, cryptocurrency, cash payments, firearms and alleged criminal connections across national borders. Eight people have been arrested in connection with the case, although authorities have yet to disclose the suspected motive for the planned killings or identify the alleged organizers behind the contract.

The operation began on the evening of August 10, when a user oper...