This has appeared on the BBC news site:
"Police are dealing with an "ongoing incident" on board an oil tanker situated off the Isle of Wight.
The tanker, named in reports as the Liberian-registered Nave Andromeda, was due to dock in Southampton earlier.
Hampshire Constabulary said: "We are aware and dealing with an ongoing incident on board a vessel which is situated south of the Isle of Wight."
The Maritime Coastguard Agency said it was assisting police and search and rescue helicopters were at the scene."
I hope this not a potential terrorist threat.
See https://www.bbc.co.uk/news/uk-england-hampshire-54684440