AFP

David Granger said he was ready to serve for five more years

The US and other countries say they are concerned by "credible allegations" of fraud in Guyana's election.

US Western Hemisphere affairs official Michael Kozak said no candidate should declare victory or be sworn in "while serious questions remain".

President David Granger was defending a narrow parliamentary majority against Irfaan Ali of the opposition PPP party.

Mr Granger declared victory, but observers said official results for a key region were not credible.

In their joint statement on Friday, US, British, Canadian and EU officials said they were worried about alleged electoral fraud influencing the results of the 2 March vote.

"We call on President Granger to avoid a transition of government which we believe would be unconstitutional as it would be based on a vote tabulation process that lacked credibility and transparency," the statement said.

AFP

Opposition leader Irfaan Ali (L) and his PPP party say they won

International observers earlier expressed concerns, saying vote counting for Region Four - the most populous electoral district - was "interrupted and remains incomplete".