The US Federal Maritime Commission (FMC) has launched investigations into detention charges levied by two major liner operators.

The regulator is looking into Wan Hai Lines and Ocean Network Express (ONE), according to filings made on 30 December.

The commission alleged Taiwanese container ship company Wan Hai charged shippers fees ranging from $125 to $1,550 per container at least 21 times without giving a return location for the container, giving a return location where there were no appointments available, or giving a location where a chassis cannot...