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Biohazard tents were set up at the Port of Dover following reports of migrants arriving from France feeling unwell.
Staff were seen in protective suits at the harbour's main processing facility earlier today.
Blue control tents were erected near the main gangway where small boat arrivals are disembarked by Border Force vessels.
Onlookers told how personnel also wore face masks as dozens of migrants were unloaded onto dry land at about 5pm.
The nature of any potential illness has not been confirmed.
A Home Office spokesman said: “Precautionary measures, such as staff wearing protective clothing and enhanced cleaning were taken, in line with UK Health Security Agency guidance, following reports of some small boat arrivals being unwell.
“This is a routine response with prearranged protocols which are designed in cooperation with UKHSA.”