Four members of El Salvador’s military were abducted Sunday in Haiti, and their president wants them back.

The mayor of Kenscoff, a town near Haiti’s capital, wrote government officials hundreds of letters to warn of gang threats. Then dozens of people died, and he did, too.

A new U.N.-backed military force is fighting to wrest control of the Haitian capital from violent gangs. Previous efforts by international troops failed to restore security. Can this one succeed?

A U.N.-backed force sent to combat gang violence said it was looking for the soldiers, who were in a gang-controlled area when they were attacked.