World Cup terror threat makes tavern goers think twice in Kenya, Uganda and Nigeria

A popular Nairobi bar that should have been packed for the opening match of the World Cup was half full at best, and people may be asking themselves if it's worth risking a potential bomb attack to watch a sporting event.

And in Nigeria, fewer than 50 people watched a massive screen at Freedom Park in Lagos. The Kyadondo Rugby Club in Kampala, Uganda was nearly empty. The club was one of two spots bombed by al-Shabab militants during the 2010 World Cup final, killing 74 people.

The U.S. Embassy in Kenya this month warned citizens to "exercise caution" at venues with World Cup crowds.

Robert Besseling, Africa analyst at IHS Country Risk, said World Cup screening venues in 10 mostly African countries face risk of attack.