Bangladeshi national detained in seaside town of Hayle on Monday night on suspicion and he is being questioned at a police station in the Devon and Cornwall area on suspicion of preparing for an act of terrorism.
A police spokesman said the arrest was in relation to conflicts overseas and not linked to any immediate threat to local communities or other parts of the UK.
A south-east counter terrorism unit (Sectu) spokeswoman confirmed the arrest was related to the ongoing conflict in Syria.
West Cornwall local police area commander Superintendent Jim Pearce said, “I would like to reassure the community that this investigation should have very little impact on local residents. The arrest was pre-planned and was not made in response to any immediate threat to public safety in Hayle. Our officers will continue to maintain a presence in the area, offering reassurance to the local community.”
A shop manager, who works in Fore Street, where the man is believed to have been arrested, said police remained in the area today.
The woman, who did not want to be named, said: “We’re all shocked. We can’t believe it.”
A 21-year-old man was detained in Hackney, north-east London, last Wednesday, while a 25-year-old woman in Bedfordshire and a 32-year-old man in London were questioned on 22 October.
Three men and three women were also arrested in Portsmouth and Farnborough in Hampshire and Greenwich, in south-east London, on 14 October.
A Sectu spokeswoman would not confirm whether the latest arrest was linked to any other case.