Hawzah News Agency (Istanbul, Turkey) - The man, identified by his initials Z.C., was arrested in a village in the central Turkish province of Cankiri, where he was working as an acting village imam, Anadolu news agency reported.
The private Dogan news agency also reported that he had escaped to Afghanistan while on trial for his role in the attack.
The suspect was later convicted of membership in the al-Qaeda network and sentenced to six years in prison.
The al-Qaeda attacks in Istanbul in November 2003 targeted the HSBC bank, two synagogues and the British consulate, killing 57 people.