A 21-year-old man has been arrested at Birmingham Airport on suspicion of terrorism, police said.
The man is believed to be Waheed Ahmed, the son of a Labour councillor, who was detained in Turkey earlier this month along with eight of his relatives as they allegedly tried to cross the border into war-torn Syria.
Greater Manchester Police said they are working to ensure the safe return of the rest of the group, which included four children aged one, three, eight and 11.
A Labour councillor's son who was detained in Turkey on suspicion of trying to enter Syria illegally is being flown back to the UK, it has been claimed. Waheed Ahmed, from Rochdale, Greater Manchester, and eight of his relatives were stopped by Turkish authorities as they allegedly tried to cross the border into the war-torn country on April 1.
Simon Danczuk, who is defending the Rochdale seat for Labour in the General Election, said he been told by the Foreign Office that Ahmed was due to arrive into Birmingham Airport today.
The Foreign Office said it did not comment on individual cases. Mr Danczuk could not confirm when the remaining eight Britons would return to the UK.
Waheed Ahmed - one of nine Britons detained in Turkey on suspicion of trying to travel illegally to Syria - has been deported and is believed to be on his way back to the UK.
Turkey has recalled its ambassador to the Vatican following controversial remarks from Pope Francis during a Mass to mark the 100th anniversary of the Armenians massacre.
During the service, the Pope described the massacre of as many as 1.5 million Armenians as "the first genocide of the 20th century".
Turkey has long refused to call the event a genocide and has insisted that the toll has been inflated, and that those killed were victims of civil war and unrest.
At a 100th anniversary Mass, Pope Francis said the massacre of up to 1.5 million Armenians was the first genocide of the 20th century.Read the full story ›
The families of two "ordinary Yorkshire lads" who are believed to have travelled to Syria have issued pictures of the 17-year-olds.Read the full story ›
The "devastated" families of two 17-year-old boys who are believed to have travelled to Syria said the teenagers are "ordinary Yorkshire lads".
The statement said: "Both families are devastated by the events of the last few days and in particular, we are extremely concerned about the safety and well-being of our loved ones.
"These were just two ordinary Yorkshire lads who enjoyed the things that all young people enjoy at their age – both Hassan and Talha had a promising future as an apprentice and an A level student respectively, and we are praying they will be back with us soon and are able to realise that future."
Thomas Cook Airlines has said that it "cannot confirm" the names of passengers that have travelled with the firm amid reports of two 17-year-old boys from Dewsbury who are believed to have travelled to Syria via one of the company's flights to Turkey.
"Whilst we cannot confirm the names of any of our passengers who travel with us, we can reassure all our customers that we work closely with all authorities to ensure the safety of our flights in and out of the UK," a spokesman for Thomas Cook Airlines said.
Two 17-year-old boys from Dewsbury are believed to have travelled to Syria police have said.
Assistant Chief Constable Mark Milsom, of West Yorkshire Police, said: "We are extremely concerned for the safety of these two boys and would urge anyone with information to come forward and speak to us.
"Our priority is for their safe return; their families are gravely worried about them and want them home.”
The boys were last seen by their families early on Tuesday 31st March and are believed to have boarded a Thomas Cook flight at Manchester Airport later that day to Dalaman in Turkey.
Turkey's SuperLig has been suspended for one full week of fixtures after a gun attack on Fenerbahce's team bus.
The measure was announced by the Turkish Football Federation on Monday.