An explosion on a bus in Kenya's capital city has left several people dead, according to authorities in Nairobi. No group has claimed responsibility for the attack.
At least four people were killed and over a dozen wounded on Saturday when an unidentified device was exploded on a Nairobi bus, according to local police.
Some reports said assailants had thrown a grenade at the vehicle as it was travelling through the city's Eastleigh suburb, which has a large Somali community.
"We are investigating to establish if the explosion was caused by a grenade or an improvised explosive devise, we also want to establish if the attacker was in the vehicle or if it was thrown at it," Nairobi area police chief Benson Kibue told news agency AFP.
There was no immediate claim of responsibility.
At least one attack this week in Kenya was thought to have been carried out by members of the Somalia-based terrorist group al-Shabaab.
In September al-Shabaab gunmen raided Westgate mall in Nairobi. The attack came in response to Kenya's military presence in Somalia as part of an African peacekeeping mission. Sixty-seven people were killed in the four-day siege.
- AP, AFP, Reuters