ANKARA - A Turkish soldier who went missing this week on the border with Syrian territory controlled by Islamic State has been seen in a hospital run by the militants, Hurriyet newspaper reported on Saturday.

If confirmed, the soldier's capture would be a major problem for Turkey, after it stepped up military action against Islamic State in July, opening its air bases to US-led coalition war planes and launching air strikes.

The soldier vanished and another was killed in cross-border shooting with Islamic State fighters on Tuesday near the Turkish town of Kilis, close to Syrian territory that has been under Islamic State control for months.

According to security sources citing intelligence reports, Hurriyet Daily News reported that the soldier had been wounded in the foot and was taken by militants to a hospital under their control close to the Syrian city of Aleppo.

Turkish officials declined to comment.