Two members of a Rio Bravo music group were found dead Sunday, just one day after they were reported missing.

Elias and Qitlanhuat Hernandez were part of the group Los Nortendos.

Mexican authorities say their bodies were found in a pick-up truck south of Reynosa.

A poster was also found next to them, with the name of a criminal group claiming responsibility for their killings.

A reward of $2 million pesos, nearly $100,000 in U.S. currency, is being offered for information leading to the arrest of those responsible.