Kenya's Prime Minister Raila Odinga has been evacuated from his office after an unexploded hand grenade was found in another part of the building he works in.

Aides to Mr. Odinga say police advised the prime minister to leave his building in the capital, Nairobi, at about 1 p.m. Tuesday.

They say Mr. Odinga was meeting with Chief Justice Willy Mutunga at the time.

Police say a plumber found the hand grenade, but there was no immediate word on who planted it.