Debris lies strewn outside the Ethiopian Village restaurant in Kampala, Uganda, after explosions on July 11 tore through venues where people had gathered to watch the FIFA World Cup final. (Marc Hofer/Associated Press)An African Union summit officially began in Kampala on Monday, a week after twin bombings killed 76 people watching the World Cup soccer final in the Ugandan capital.

The arrival of delegates from 49 countries "shows that terrorists cannot defeat us," said Uganda's foreign minister, Sam Kutesa. Extra security is in place to protect leaders and their support staff.

The Somalia-based Islamic insurgent group, al-Shabaab, claimed responsibility for the July 11 suicide bombings. The militants warned that attacks would continue if Uganda did not withdraw the troops it contributes to the African Union peacekeeping force in Somalia.

Ugandan police said on the weekend they have detained 20 suspects in connection with the bombings.

The headline theme for the summit is maternal and child health. But the agenda also includes peace and security issues, infrastructure, energy, agriculture, and food security.

Most of Africa's heads of state will be in Kampala for the summit, which wraps up July 27.

With files from The Associated Press