Police are continuing to question a teenager arrested at a British airport on suspicion of Syria-related terrorism offences.
The 18-year-old man from Birmingham was held by counter-terrorism officer at Manchester Airport on Saturday after returning to the UK, West Midlands Police said.
A force spokesman said: "(The) arrest follows the arrest of a man and a woman on 4 April. The pair, a 24-year-old man and a 20-year-old woman, both from Birmingham, are currently on police bail.
"There was no risk to any passengers at Manchester Airport or to the wider public in relation to these arrests."
He added that arrests and this investigation are not connected to the terrorism arrests of five people from Birmingham on Friday.