One person is reported killed and at least 27 others wounded in two blasts on passenger buses in the Kenyan capital Nairobi.
Both blasts went off on Thika road, a busy highway north-east of the city.
One of the explosions ripped open the side of a bus and a rescue operation was under way, NTV reported.
Sunday's attack was the second in Kenya in as many days. Recent violence has been blamed by the government on Somali Islamist group al-Shabab.
According to reports, the two explosions went off outside a hotel and at an underpass not far from Kasarani, north-east of the capital.
Television footage showed a large red bus with a big hole in its side and a green bus that had also sustained serious damage.
There has been no official confirmation of the number of casualties.
Deputy police chief Moses Ombati, quoted by the Associated Press, said one person had died in the attacks.
A doctor treating casualties at Ruaraka Uhai Neema Hospital, Antonio Milito, told Kenya's Daily Nation newspaper that two people had been killed.
On Saturday, a grenade was thrown in a bus in the coastal city of Mombasa leaving four people dead and another 15 wounded. The bus had just travelled from Nairobi. There was a second blast near a beach-front hotel, but no-one was hurt.
The al-Qaeda-linked group al-Shabab has carried out several attacks in Kenya since 2011, when Kenya sent troops into Somalia to battle it.
Kenya has vowed to halt attacks by militant Islamists and arrested some 2,000 people in the capital last month.
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