A family of four including two young children were among 18 migrants found on boats in the English Channel in the early hours of Thursday morning.
The Home Office said a Border Force cutter intercepted the first small boat about four miles south-east of Folkestone, Kent as it headed towards the UK, at about 4am.
Officers were alerted to the boat as it passed near the Port of Dover, Kent Police said.
Five men found on board, who said they were Iranian, were taken to Dover and handed to immigration officers.
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Around an hour later, the cutter found a second boat containing 13 people two miles south of Folkestone, situated off the Kent coast.
The family of four were found on board – father, mother and two young children – along with nine other men. They said they were from either Iran or Iraq.
It comes just one day after 14 migrants, including two children, were also found off the south coast.
A Border Force team intercepted the vessel and brought the group to Dover, where they were assessed.
The migrants presented themselves as Iraqi and Iranian nationals, and were passed to immigration officials for interview.