KAMPALA, Uganda — In simultaneous bombings bearing the hallmarks of international terrorists, two explosions ripped through crowds watching the World Cup final in two places in Uganda’s capital late Sunday, killing 64 people, police said. One American was killed and several were wounded.

The deadliest attack occurred at a rugby club as people watched the game on a large-screen TV outdoors. The second blast took place at an Ethiopian restaurant, where at least three Americans were wounded.

One American was killed in the blasts, said Joann Lockard, a spokeswoman for the U.S. Embassy in Kampala.

Kampala’s police chief said he believed Somalia’s most feared militant group, al-Shabab, could be responsible for the attack. Al-Shabab is known to have links with al-Qaida, and it counts militant veterans from the Iraq, Afghanistan and Pakistan conflicts among its ranks.

At least three Americans – part of a church group from Pennsylvania – were wounded at the Ethiopian restaurant.

One was Kris Sledge, 18, of Selinsgrove, Pa. “I remember blacking out, hearing people screaming and running,” Sledge said from the hospital.

Police Chief Kale Kaihura originally said at least 30 people had been killed. Later, a senior police official at the scene said that 64 people had been killed, 49 from the rugby club and 15 at the Ethiopian restaurant.

In Mogadishu, Sheik Yusuf Sheik Issa, an al-Shabab commander, refused to confirm or deny al-Shabab was involved.