One person has been killed and eight others wounded in a blast in a mainly Somali neighbourhood in Kenya’s capital Nairobi, police say.A roadside bomb exploded during rush hour traffic in the Eastleigh neighbourhood on Wednesday evening, police said.Last month, a grenade blast in Eastleigh left seven people dead.Kenya accuses Somalia’s al-Qaeda-linked al-Shabab militant group of trying to destabilise the country.Agencies report that its correspondent at the explosion site saw pools of blood on the ground, as the wounded were swiftly moved away."The explosion was caused by a roadside bomb which had been placed in a hole in the ground,” Nairobi police chief Moses Nyakwama told the AFP news agency."No arrests have been made yet, and investigations are already under way,” he added.Al-Shabab has not yet commented on the blast. Last month, Kenya accused the group of launching a grenade attack on a bus in Eastleigh, killing seven people.The attack triggered riots in the area, as angry youths burnt and looted Somali-owned shops.Kenya’s government has blamed al-Shabab for a spate of explosions and kidnappings on its territory.Kenya last year sent its troops to fight al-Shabab in Somalia - they have now joined the 18,000-strong African Union (AU) force supporting the UN-backed government.