Polls in Iran are going to stay open at least one extra hour, the Associated Press reports, "because of heavy queues at polling stations." The new closing time is 10:30 a.m. ET (that's 7 p.m. local time in Tehran).
Iran's Interior Ministry expects 70% of eligible voters will have turned out by day's end.
NPR.org's coverage of the pivotal election is collected here.
Update at 1:05 p.m. ET: Now, voting's been extended to 3:30 p.m. ET -- midnight in Iran.
Update at 11:45 a.m. ET: Another one-hour extension, to 12:30 p.m. ET.
Update at 10:45 a.m. ET: Voting has been extended again, to 11:30 a.m. ET.