U.S. and Colombia Investigate Killing of Haiti’s President

United States and Colombian officials say they will work with Haiti to understand the origins of a complicated plot that left Haiti’s president dead and the country in chaos even as Haitian investigators confront questions emerging closer to home.

Of the at least 20 people detained so far in the investigation into the assassination of President Jovenel Moïse this past week, 18 have been identified as Colombians and two as Haitian Americans. Five suspects are still being sought.

At least 13 men said to be involved in the plot had served in the...