By TOM ODULA

Associated Press

NAIROBI, Kenya (AP) -- At least three people were killed Saturday after a device exploded inside a passenger van in the capital, Kenyan police said, in what appears to be the first attack inside Nairobi since the deadly terrorist assault on an upscale mall in September.

The explosion happened as the minibus was traveling from Eastleigh suburb of Nairobi to the city center, said Benson Kibue, chief of police in Nairobi. Investigators believe an improvised explosive device was used in the Saturday attack that likely killed more people, he said. No more details were immediately available.

Kenya has been the scene of multiple attacks since the country sent its military to Somalia to fight the al-Qaida-linked Islamic rebels of al-Shabab.

At least 67 people were killed in the Sept. 21 attack on Nairobi’s Westgate Mall in a siege that lasted four days. That attack was claimed by al-Shabab.