Story highlights Three Spanish journalists have gone missing in northern Syrian city of Aleppo

The war-torn city is divided into various areas of control

International journalist organization Reporters Without Borders fears the men have been kidnapped

(CNN) A trio of Spanish journalists has gone missing in the northern Syrian city of Aleppo, with journalist organizations in Spain and abroad fearing that they've been taken by militants.

The city is held variously by loyalist forces, extremist groups including the al Qaeda-affiliated al-Nusra Front, and other anti-government militia. ISIS also lurks on the fringes of the devastated city.

The three men -- Antonio Pampliega, Jose Manuel Lopez and Angel Sastre -- appear to have entered Syria from southern Turkey on July 10. They have not been heard of since July 13. A local fixer who was reportedly working with the men has also gone missing.

"We are now working to find them but for the time being we don't know where they are," a joint statement from the mens' families read, which also asked for "as much discretion as possible" in order to help locate them.

A source at the Ministry of Foreign Affairs in Spain confirmed to CNN that the three men had gone missing.

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