[Updated at 10:10 p.m.] At least six Americans are among those injured in Sunday's bombings in Kampala, Uganda, CNN has confirmed.

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[Updated at 6:50 p.m.] At least nine people have died in pair of bombings that struck a restaurant and a rugby ground in Uganda's capital as patrons gathered to watch Sunday's World Cup final, police said.

Nine people died and five were wounded at an Ethiopian restaurant in Kampala, police spokeswoman Judith Nabakooba said. But there was a yet-undetermined number of fatalities and injuries at a rugby field where other fans gathered to watch Sunday night's match between Spain and the Netherlands, Nabakooba said.

Earlier, police indicated that at least 40 people had been killed in the two bombings.

The bombs went off within 25 minutes of each other shortly after 10 p.m. (3 p.m. ET), as fans gathered in both locations. There was no immediate claim of responsibility for what Nabakooba called "definite acts of terrorism."

Islamic militants battling Somalia's U.N.-backed transitional government have threatened attacks on Uganda and Burundi, which contribute troops to an African Union peacekeeping mission in Somalia. But Nabakooba said the investigation of Sunday's bombings is not yet focused on any specific group.

[Posted at 6:08 p.m.] At least 40 people have died in a pair of bombings that struck a restaurant and a rugby club in Uganda's capital as patrons gathered to watch Sunday's World Cup final, police said.

Journalist Samson Ntale contributed to this report for CNN.