Authorities are reviewing how migrant boats reached the English coast undetected this week, amid claims that a decoy emergency call was used to divert Border Force, with 21 people detained and up to 10 missing.

Twenty-one migrants were detained at Samphire Hoe near Dover on Tuesday after a suspected decoy 999 call claiming a sinking dinghy diverted Border Force boats into the Channel, with up to 10 people unaccounted for; Home Secretary Shabana Mahmood called the failure to intercept 'not acceptable' as the Home Office urgently reviews the incident and another undetected crossing on Monday.