The Manx constabulary is flagging up concerns of violence as they predict the arrival of UK drug dealers to Manx shores.
The criminals are expected to travel to the island in the coming weeks to collect owed cash.
Border restrictions for the Isle of Man eased on 28 June.
As the borders reopened police increased their patrols and worked in conjunction with the Merseyside force to head off any problems.
Officers are urging anyone with information or any concerns to contact the anonymous Crimestoppers Line on 0800 555 111.
Marquee plan submitted by Milntown Estate
Fire crews called to free driver from crashed car
Manx Museum celebrates 10 years of UNESCO Biosphere status
Volunteer wanted to help monitor Island's prison
MHK asks if families should get help with UK parole travel costs
Peel RNLI honoured for lifesaving actions at sea
Plans submitted to turn former offices into homes
Island has just 20 vacant homes for public tenants