Nairobi , Kenya ( CNN ) -- At least 10 people were killed in two explosions Friday in central Nairobi , the Kenya National Disaster Operation Centre said via Twitter . As many as 76 people were wounded in the blasts at the Gikomba market and on a public minibus , the disaster agency said . Ambulances evacuated 43 injured males and 33 injured females , the Centre said via Twitter . Two suspects were arrested in connection with the explosions , which were caused by grenades , according to Nairobi Police Commandant Benson Kibuye . There have been no claims of responsibility in the attack . Kenyan President Uhuru Kenyatta expressed his sympathy to those affected by the blasts , the Interior Ministry said via Twitter . The explosions came after the United States , Australia and UK issued travel alerts for the African nation Thursday . Hundreds of vacationers were evacuated from Kenya the same day in response to the alerts , which warned of a `` high threat '' of terrorist attacks . Kenyan authorities described the warnings as `` unfriendly acts '' and said security remains a top priority . `` Terrorism is not an evil that was born in Kenya , terrorism is a world wide phenomenon , '' the Kenyan President said in his state of the union address . As he delivered that speech Friday , the blasts rocked the central part of the capital . The Kenyan military crossed into Somalia in 2011 to battle the terrorist group Al-Shabaab , which it blamed for kidnapping tourists in the coastal region . In retaliation , the terrorist group has launched a spate of attacks , including targeting bustling bus stations with grenades . Last year , militants stormed the Westgate Mall in Nairobi and held shoppers under siege for days . At least 67 people were killed . CNN 's Azadeh Ansari reported and wrote from Atlanta . CNN 's Pierre Meilhan reported from Atlanta . Journalist Lucy Wamweya reported from Nairobi . CNN 's Faith Karimi and Lindsay Isaac also contributed to this report .
Police : Blasts were caused by grenades , Two arrested . two explosions killed 10 people in central UK , officials said . Kenyan President expressed his sympathy to those affected . Attacks come after Nairobi , Australia , Australia issue travel alerts .