A partial ballot recount in Venezuela has reduced Nicolas Maduro's advantage in the presidential election two weeks ago, the National Electoral Council (CNE) said Monday.

With the update of overseas votes and 99.79 percent of the total domestic votes counted, the margin between Maduro and Capriles has been narrowed to 225,000 votes, said the council.

Maduro led with 50.61 percent of the vote, compared with 49.12 percent for opposition leader Henrique Capriles.

Venezuelans living abroad cast a total of 57,992 ballots, of which 93 percent were for Capriles, according to a latest bulletin of the CNE.

The opposition rejected the audit on Monday, saying that the move is insufficient and that it will challenge the results at the Supreme Tribunal of Justice in the coming days.

The CNE rejected a request of the opposition to have access to all the logbooks -- records and proof of voting -- to dispel doubts about election irregularities.

"It is a fake audit, because it does not take into account the voting logbooks," said Capriles. "It's like someone going to the supermarket, paying and leaving with nothing," he said.

The CNE has insisted that it is legally impossible to carry out a full recount.

Tensions have been building up after the electoral authority declared Maduro the winner of the April 14 presidential poll. The opposition has demanded a full recount on grounds of irregularities.

The election was held after the death of former President Hugo Chavez in March.