A Kenyan MP and three of his aides have been shot dead in the capital Nairobi, in what police described as a "well planned" attack.
George Muchai was driving home through Nairobi, when his vehicle was rammed by another car at a roundabout.
The assailants shot the four at close range. Mr Muchai, two bodyguards and his driver died at the scene.
The motive for the attack, condemned by the president and the leader of the opposition, remains unclear.
"It seems to us like something that was well planned," an unnamed police officer said.
Police said the attackers stole a briefcase and the bodyguards' pistols.
Mr Muchai was a member of parliament for Kenya's governing Jubilee coalition and was elected for the first time two years ago.
Kenyan President Uhuru Kenyatta said he was shocked by the attack, calling Mr Muchai "a true servant of the people".
Opposition leader Raila Odinga has also condemned the killing, but said it was part of wider insecurity in Kenya.
"Our country is bleeding and an atmosphere of fear and hopelessness is spreading from the unresolved murders and deaths," Mr Odinga said in a statement.