A blast has gone off at a bus stop in Kenya's capital, Nairobi, killing at least one person, police say. 肯尼亚警方称，首都内罗毕一座公交车站发生爆炸案，至少一人死亡。
Witnesses said a man threw a grenade into the nightclub and fled the scene overnight
An earlier grenade（手榴弹） attack on a bar in the city wounded 12 people.
The attacks happened two days after the US embassy in Kenya warned that an attack by Islamist militants from neighbouring Somalia was imminent（即将来临的） .
But Kenyan Police Commissioner Matthew Iteere said there was no evidence linking the nightclub attack to the militants from the al-Shabab group.
The Kenyan government sent troops to Somalia more than a week ago to pursue the militants after accusing them of being behind a spate of abductions（绑架） on its territory.
Al-Shabab, which is linked to al-Qaeda and controls much of southern and central Somalia, denies involvement in the kidnappings but has warned of reprisals（报复） if Kenyan troops do not withdraw from Somalia.
Police said the explosion on Monday evening occurred at the OTC bus terminal in downtown Nairobi, which is usually a busy part of the city.
Kenya's Red Cross said on its Twitter feed that eight casualties had been rushed to Kenyatta National Hospital.
In the early hours of Monday morning a man threw a grenade into the Mwauras nightclub and fled the scene, witnesses said. No-one has claimed responsibility for the attack.
The BBC's Will Ross in Nairobi says last December three people died during a grenade attack at a bus in Nairobi. It was never clear who was behind it.
Our correspondent adds that although both attacks were small, they will nevertheless cause a great deal of anxiety in Kenya.
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