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A man survey's the damage after two improvised explosive devices (IED) went off in Gikomba market on May 16, 2014 in Nairobi, Kenya. Two improvised explosive devices (IED) were activated, killing several people and injuring more than 70. One person has been apprehended as a suspect in the attack. (Photo by Christena Dowsett/Getty Images) ( 491339347 )

Police investigators look into a damaged public transport vehicle at the scene of an explosion on May 16, 2014 on the outskirts of Nairobi's business district where twin explosions claimed at least 10 lives. Ten people were killed and over 70 wounded in two bomb attacks in a busy market area in the Kenyan capital of Nairobi, officials said Friday. (TONY KARUMBA/AFP/Getty Images) ( 529819755 )

Onlookers gather behind police tape at the site where two blasts detonated, one in a mini-van used for public transportation, in a market area of Nairobi, Kenya, Friday, May 16, 2014. Two blasts hit Kenya's capital on Friday, killing a number of people and injuring many more, in what appeared to be the latest in a string of increasingly frequent terror attacks. (AP Photo) ( Kenya Security Warnings )

A soldier in the Kenya Defense Forces (KDF) keeps control of onlookers after two improvised explosive devices (IED) went off in Gikomba market on May 16, 2014 in Nairobi, Kenya. Two improvised explosive devices (IED) were activated, killing several people and injuring more than 70. One person has been apprehended as a suspect in the attack. (Photo by Christena Dowsett/Getty Images) ( 491339327 )

A victim is carried to an ambulance after two improvised explosive devices (IED) went off in Gikomba market on May 16, 2014 in Nairobi, Kenya. Two improvised explosive devices (IED) were activated, killing several people and injuring more than 70. One person has been apprehended as a suspect in the attack. (Photo by Christena Dowsett/Getty Images) ( 491339321 )

Kenyan paramedics help an injured lady at the Kenyatta National Hospital on May 16, 2014 in Nairobi. Ten people were killed and over 70 wounded in two bomb attacks in a busy market area in the Kenyan capital Nairobi, officials said Friday. (SIMON MAINA/AFP/Getty Images) ( 529821575 )

British tourists queue up check-in at the Moi International Airport in Mombasa on May 16, 2014. Around 400 British tourists are being evacuated from the Kenyan resort of Mombasa after Britain stepped up travel warnings following a wave of terror attacks, travel agents said on May 16. Special charter flights were organized days after Britain, France, Australia and the United States issued new travel warnings for Kenya's coast following a wave of attacks and unrest linked to Islamist extremists. Tourism is a crucial part of Kenya's economy: according to the most recent figures from 2011, the sector directly or indirectly accounted for 14 percent of economic output and roughly 12 percent of the workforce. (Ivan Lieman/AFP/Getty Images) ( 529816914 )

A forensics experts combs through the scene of an explosion in Gikomba on the outskirts of Nairobi's business district where twin blasts claimed at least ten lives on May 16, 2014. Ten people were killed and over 70 wounded when two bomb attacks in a busy market took place in the Kenyan capital Nairobi, the latest in a wave of unrest blamed on Islamist militants. (John Muchucha/AFP/Getty Images) ( 529822365 )

Kenyan paramedics take care of an injured man at the Kenyatta National Hospital May 16, 2014 in Nairobi. Ten people were killed and over 70 wounded in two bomb attacks in a busy market area in the Kenyan capital Nairobi, officials said Friday. (SIMON MAINA/AFP/Getty Images) ( 529821855 )

Kenyan paramedics lift an injured man at the Kenyatta National Hospital on May 16, 2014 in Nairobi. Ten people were killed and over 70 wounded in two bomb attacks in a busy market area in the Kenyan capital Nairobi, officials said Friday. (SIMON MAINA/AFP/Getty Images) ( 529821698 )

Clothing hangs from a power line as members of Kenya's General Service Unit (GSU) discuss two improvised explosive devices (IED) which went off in Gikomba market on May 16, 2014 in Nairobi, Kenya. Two improvised explosive devices (IED) were activated, killing several people and injuring more than 70. One person has been apprehended as a suspect in the attack. (Photo by Christena Dowsett/Getty Images) ( 491339337 )

A Kenyan policeman stands at the scene of an explosion in Gikomba on the outskirts of Nairobi's business district where twin blasts claimed at least ten lives on May 16, 2014. Ten people were killed and over 70 wounded when two bomb attacks in a busy market took place in the Kenyan capital Nairobi, the latest in a wave of unrest blamed on Islamist militants. (John Muchucha/AFP/Getty Images) ( 529822437 )