Kenyan PM Odinga will not concede presidential election -advisor

NAIROBI, March 9 (Reuters) - Kenyan Prime Minister Raila Odinga will not concede this week's election and will launch a legal challenge if rival Uhuru Kenyatta is officially declared president, an adviser said on Saturday.

Provisional results released on Saturday handed Kenyatta a slim outright win.

"He is not conceding the election. If Uhuru Kenyatta is announced president-elect then he will move to the courts immediately," said Salim Lone, a close adviser to Odinga.

Kenyatta won the first round with 50.03 percent of the vote, which means he avoided a run-off. The results must be officially confirmed by the Independent Electoral and Boundaries Commission. Odinga trailed with 43.28 percent of the presidential vote.

(Reporting by Richard Lough; Editing by Stacey Joyce)