Dutch authorities found 25 migrants stowed away on a cargo ferry bound for UK shortly after it left the Netherlands on Tuesday and the vessel quickly returned to the Dutch port of Vlaardingen, emergency services said.
Two of the migrants were taken to hospital for treatment while the other 23 received a medical check-up in the port before being taken away by police for processing, Reuters reported.
The origins of the migrants is not known, and images of the stowaways being led to busses show mainly young men.
Authorities found the migrants in a refrigerated container on a truck aboard the ferry, the statement noted.
Police informed the Dutch national broadcaster NOS that they had detained the driver and he was being questioned over his possible involvement in human trafficking.
On Oct. 23, 39 bodies, all believed to be Vietnamese migrants, were discovered in the back of a refrigerated truck near London.
Two people have been charged in UK and eight in Vietnam over the deaths.
The container in which the bodies were found had arrived on a ferry from Zeebrugge in Belgium.