The European Union's chief observer in Zimbabwe's election, Elmar Brok, says many voters, especially young women, left voting queues in frustration because of long delays, Reuters news agency reports.

He stressed that while the EU had not yet reached a conclusion about the poll, voting went "very smoothly" in some areas but was "totally disorganised" in others, resulting in angry voters leaving queues, Reuters reports.

This is the first time in 16 years that the EU has been allowed to observe Zimbabwe's election.