Shippers are bracing for additional surcharges as liner operators seek to cover the costs of higher charter rates, additional port fees, and demurrage.

The warning from the UK shippers body British International Freight Association (BIFA) comes as liner operators continue to pile premium charges on key routes, mostly out of Asia.

Complaints from US shippers over surcharges this week led the Federal Maritime Commission to launch a probe into congestion fees that eight lines have begun charging shippers.