Record turnout in Iran presidential poll

There has been record turnout for Iran's closely-fought election as incumbent President Mahmoud Ahmadinejad seeks a second term in office.

"Voter turnout has been unprecedented," election commission chief Kamran Daneshjoo said, as long queues were reported at polling stations.

Polling has been extended by two hours to 2000 local time (1530 GMT).

Mr Ahmadinejad faces a strong challenge from former PM Mir Hossein Mousavi in a campaign dominated by the economy.

The election is being watched closely around the world for signs of a possible shift in Tehran's attitude.

If no candidate gets 50% in the first round, the two front-runners will face a run-off vote.

There has been a surge of interest recently in Iran's presidential election, with unprecedented live television debates between the candidates and rallies attended by thousands.