The Border Force has intercepted several groups of migrants in the English Channel.
The Ministry of Defence (MoD) would not reveal the numbers involved until Monday, but people who count arrivals in Dover have told the BBC they believe it was more than 200.
The MoD said the government is addressing the issue by “cracking down on people smugglers”.
It is believed to be the first time there have been crossings in 11 days.
Some commentators have suggested the prospect of asylum seekers getting sent to Rwanda was already acting as a deterrent – but the weather has been windy in the Channel for the past 11 days which is likely to have had a greater effect.
