Explosion inside Kenya minibus kills at least 4

NAIROBI, Kenya (AP) At least four 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 neighborhood 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 injured at least 25 others, he said.

Sometimes called Kenya's "Little Mogadishu," Eastleigh is known for its large population of ethnic Somalis. The neighborhood came under fresh scrutiny by investigators following the Sept. 21 attack on Nairobi's Westgate Mall, a bloody four-day siege in which at least 67 people were killed. A Western official familiar with the Westgate attack investigation told The Associated Press last month that all four attackers were ethnic Somalis who had spent time in Eastleigh. The official confirmed that all four gunmen arrived in Kenya in June and attended a gym in the neighborhood.

Kenya has been the scene of multiple terrorist attacks since the country sent its military to Somalia in 2011 to fight the extremist Somali militant group al-Shabab.

Al-Shabab claimed responsibility for the Westgate attack, saying it was in retribution for Kenya's involvement in Somalia. The group, which is linked to al-Qaida, had threatened large-scale attacks for years, and it has said more will be carried out unless Kenya withdraws.

Kenya has been grappling with its large population of Somali refugees since the Westgate attack, with government officials announcing plans to speed up their return home. Nearly 500,000 Somali refugees live in Kenya, most of them in the sprawling Dadaab refugee settlement near the Somali border. In the last several years Somali refugee camps, particularly Dadaab, have been hit by a spate of blasts by grenades and other improvised explosive devices.

Last month Kenya, Somalia and the United Nations refugee agency signed an agreement saying the 475,000 registered Somali refugees inside Kenya will get support when they return to their homeland if they choose to return.