An explosion wounded six people, including a high-ranking intelligence official, in the northern Kenyan town of Wajir during Monday's celebrations of Kenya's Independence Day, an official said.
The six included the district head of intelligence and his driver, said district commissioner Kennedy Nyaiyo. Four civilian bystanders were also hurt, including two women, he said.
Government vehicles were leaving the town stadium when a device exploded under one of the cars carrying intelligence officers, said eyewitness Abdirahman Abdi.
The vehicles were in the stadium as part of a parade for Monday's celebration of 48 years of independence from British rule.
The explosion is the third attack on Kenyan security forces within two days. On Sunday, explosions killed one police officer and wounded three others in the Kenyan town of Mandera on the Somali border. Nine soldiers were wounded in a separate incident.
There has been a string of bombings in Kenya since the Kenyan government sent troops across the border into Somalia in October. They include twin attacks in the capital of Nairobi where an al-Shabab sympathizer threw grenades into a local bar and a bus stop.