NAIROBI, Kenya -- Two bombs killed 10 people and wounded 70 others Friday, tossing bodies into the air at a market in Kenya's capital, while hundreds of British tourists were evacuated from the coastal resort of Mombasa after warnings of an impending attack by Islamic extremists.
The U.S. ambassador has requested additional security and is reducing the number of people stationed at the embassy in Nairobi amid an increase in threats.
No group claimed responsibility for the blasts, which went off minutes apart in the Gikomba market near downtown Nairobi.
President Uhuru Kenyatta, appearing at a previously planned news conference shortly after the bombings, offered his condolences.
But he dismissed the tourism warnings from the U.S. and Britain that led to the evacuations, saying that terrorism is a common problem and not unique to Kenya.
As ambulances and security forces responded to the market bombing, witnesses described a chaotic scene.
"I heard the first blast, then another one," said Gikomba market trader Judy Njeri, who described crouching and crawling on hands and knees after the explosions that wounded some of her colleagues.
"I saw bodies being tossed in the air," she added. "The whole place was thrown into darkness and a lot of dust."
Police Chief Benson Kibue announced the casualty figures.
Security concerns are high in Kenya because of its proximity to Somalia and the al-Qaida-linked group, al-Shabab, which operates there. In September, four al-Shabab gunmen attacked the upscale Westgate Mall in Nairobi, killing at least 67 people.
On Thursday and Friday, TUI Travel, which owns the British tourism companies Thomson and First Choice, evacuated customers and canceled all flights to the coastal city of Mombasa until October.
The British government had urged its citizens to leave Mombasa and nearby beach towns.
The U.S. and Britain were among several nations renewing warnings of possible terrorist attacks.
Earlier this week, the U.S. warned for the first time that its embassy itself is taking new steps to increase security "due to recent threat information regarding the international community in Kenya."
On Friday, Ambassador Robert Godec sent a letter to his staff, saying he has requested assistance from the Kenyan police and State Department.
Mr. Godec said additional police are patrolling the embassy vicinity and that more assets will arrive from Washington next week.
The embassy is also reducing its staffing numbers.