The result of a first-round vote in Egypt's first parliamentary election since the overthrow of Hosni Mubarak will be announced on Thursday, state television said, a day later than planned.

The High Elections Commission is still unable to draw up a final tally because votes were still being counted in some areas, an official at the commission told Reuters.

"There is some delay as we have not been able to finish counting in some areas, including Cairo," said the official, who asked not to be named. "We also still lack the results from Egyptians living in Kuwait."

Meanwhile, the Muslim Brotherhood said on Wednesday it was leading in the initial count of results from the first round of the parliamentary election and one source in the party said it had secured 40 percent of votes cast for party lists.

A member of the rival liberal Egyptian Bloc also said that in Cairo, one area that voted on Monday and Tuesday, the list led by the Brotherhood's Freedom and Justice Party (FJP) had 40 to 50 percent of votes. His Bloc had 20 to 30 percent, he said.

The overall outcome will not be known until January. The election is spread over six weeks with different parts of the country voting separately in three phases, each of which may be followed by run-off votes.

Under an elaborate system that makes it difficult to predict the outcome, two-thirds of the 498 elected seats go to party lists and the rest to individuals.

The FJP said in a statement early indications showed it in the lead for both party-list and individual mandate seats. It said the ultra-conservative Islamist al-Nour party was next, followed by the liberal Egyptian Bloc. - Reuters