Turkish security forces on Sunday detained an American journalist and two Syrians as they tried to cross a river flowing from Syria into southern Turkey by raft, the army said.
The three were spotted on the Asi river near the border province of Hatay, the army said in a statement, without revealing their identities.
The journalist, said to be 60 years old, was taken to a police station for questioning and then flown to Istanbul for deportation, Hurriyet newspaper reported on its website.
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Nothing was immediately known about the fate of the Syrians.
The army said in a separate statement that six Turkish F-16 jets performing air patrolling duties on the border had come under a radar lock by Syrian air missile batteries for 2.5 minutes.
Turkey, a staunch opponent of the Damascus regime, hosts about one million refugees from the three-year-old Syrian conflict, many of them in camps along the border.
But its open-door policy enables refugees, rebels and smugglers to cross the border easily, creating a huge security challenge for Turkey.
In its latest attempt to prevent illegal crossings and smuggling, Turkey started on Friday to raise a portable concrete wall in the town of Reyhanli in Hatay, which hosts many Syrian refugees.