Seven men including two who appeared in court will face no further action
It follows suspected hijacking of an oil tanker off Isle of Wight last October
Police say all seven men will remain detained under immigration powers
Matthew John Okorie, 25, and Sunday Sylvester, 22, due to appear in court
But they will face no further action along with five others who were arrested
Home Office says Britons will struggle to understand how this can be the case