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Border Force officers are "urgently responding" to an incident off the Harwich coast.
A spokeswoman for the Home Office said: "Border Force is urgently responding to an ongoing incident off the coast of Harwich.
"Further details will be provided after the initial response and once the situation has been resolved."
Yesterday the Harwich lifeboat launched at 4.25pm and 11.35pm, with the Walton lifeboat also being launched for the second callout. Both callouts are understood to be related to Border Force incidents.
The lifeboats were called out to around 35 miles and 26 miles off the East Anglian coast.
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