The victory gives President Ian Khama another five years in power in the world's largest diamond producer.

So far, the BDP has won 36 of the 57 seats contested, with the count complete in 45 constituencies.

The main opposition party, the Botswana National Front, and the Botswana Congress Party have won four seats each with one going to an independent.

The BDP has been in power since independence in 1966.

The turnout in Friday's election was reported to be high, and election observers said voting went smoothly.

To select a president, the winning party needs to win 29 of the 57 parliamentary seats.
Khama's party extended its majority in parliament by capturing one more seat than before Saturday's election.

"We have just received all the results from all constituencies," Osupile Maroba, a spokesman for the Independent Electoral Commission (IEC), told Reuters by phone.

The Botswana Democratic Party (BDP) -- in power since independence in 1966 -- won 45 of the 57 constituencies, while the main opposition party Botswana National Front won 6 constituencies and its splinter party the Botswana Congress Party captured 4, Maroba said.