Kurds voted in large numbers in an independence referendum in northern Iraq on Monday, ignoring pressure from Baghdad, threats from Turkey and Iran, and international warnings that the vote may ignite yet more regional conflict.

The vote organized by Kurdish authorities is expected to deliver a comfortable "yes" for independence, but is not binding. However, it is designed to give Masoud Barzani, who heads the Kurdistan Regional Government (KRG), a mandate to negotiate the secession of the oil-producing region.

Turnout was 76 percent an hour before voting closed, the Kurdish Rudaw TV station said, later adding that vote counting had started. Final results are expected within 72 hours.