The European Union's chief observer at the Myanmar election said polling on Sunday morning in the historic vote seemed "rather reliable" in Yangon, the largest city.

Alexander Lambsdorff, head of the EU's Election Observation Mission Myanmar 2015, was monitoring voting at a school in Yangon where opposition leader Aung San Suu Kyi cast her ballot.

He said, "I can say at this time, on the morning of election day, that so far what we are observing is a procedure that looks as if it's rather reliable.

"It's not free of flaws or shortcomings, but we did not expect that."

AP