Sussex Police are still questioning a 36-year-old man who was detained at Gatwick Airport under anti-terrorist legislation on Friday.
The man, who has not been named, was arrested at the airport while travelling from the Middle East to the USA.
He is one of four men arrested under the Terrorism Act during the past seven days.
One man was detained by officers from the Metropolitan Police Anti-Terrorist Branch at premises in central London yesterday.
Another two men also remain in custody after being arrested in Leicester last Tuesday.
The deadline for questioning them under the Terrorism Act expires today.
Another man arrested in the city under anti-terrorism laws has been returned to France.
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