Turkish police closed off main traffic routes in Istanbul during Iranian President Ahmadinejad’s visit because of a potential threat against him, Turkish President Abdullah Gul said on Saturday. Heavy security was brought in during Ahmadinejad’s visit on Thursday and Friday paralysing much of Istanbul’s road network because of large traffic jams. Many residents and tourists were stranded by the road closure. Gul apologised for the traffic situation but said Istanbul police had informed him of a possible threat that “they could not ignore”. Ahmandinejad also regretted the problems caused, Press TV reported. "I declare my love for the Turks. I am very sorry for the uneasiness felt by Turks and tourists, and I apologise to the Turkish people," the Iranian president said.