A boat transporting students sinks in Congo, killing at least 20, authorities say

• The vessel was traveling in Kasai province when it sank while entering the confluence of the Sankuru and Kasai rivers, according to witnesses.
• Deadly boating tragedies are common in the central African country, where late-night travels and overcrowded vessels are often blamed.
• Witnesses say the boat may have been carrying more than 200 passengers.