For three years, Kombo Kolombia has played a Colombian style of music known as vallenato, which is popular in Nuevo Leon state. Most of the group's musicians were from the area, and have held large concerts in addition to bar performances.
Nuevo Leon state officials said one of those missing is a Colombian citizen with Mexican residency.
Members of other musical bands, usually groups that perform "narcocorridos" celebrating the exploits of drug traffickers, have been killed in Mexico in recent years. But Kombo Kolombia did not play that type of music, and its lyrics did not deal with violence or drug trafficking.