An unexploded suicide belt has been found in Kampala a day after a deadly twin bomb attack in the Ugandan capital.
At least 74 people were killed in the explosions at a rugby club as they were watching the World Cup final on TV.
Ugandan officials also say an unspecified number of people have been arrested.
The Somali Islamist group al-Shabab has said it was behind the attack because Uganda is supporting Somalia's government.
In a statement in Mogadishu, a spokesperson for the al-Qaeda linked group said it was 'happy' with the deaths and threatened more attacks.
Uganda contributes troops to a peacekeeping force in Somalia.