Greenpeace says protesters have occupied a jetty where a tanker carrying a 33,000-tonne shipment of Russian diesel was due to berth, forcing it to turn around in the Thames.
The campaign group said 12 activists gained access to Navigator Terminals in Grays in Essex and climbed onto the jetty late on Sunday.
Greenpeace says the British government is allowing what it describes as “fossil fuel money” to flow to Russian President Vladimir Putin.
Essex Police said officers were called to reports of people gaining access to the terminal shortly after 11.05pm on Sunday.
The force said eight people have been arrested on suspicion of aggravated trespass, and officers are working with partners to bring “a number of others” to safety.
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