Mexican authorities on Wednesday asked the siblings' father what they were wearing when they disappeared, mother Raquel Alvarado told The Associated Press. Witnesses said the brothers tried to intervene, but they were taken away by armed men who identified themselves as part of Grupo Hercules, a recently formed police security unit for Matamoros city officials, and were traveling in military style trucks. Hernandez was referring to the southern state of Guerrero, where 43 teachers college students disappeared Sept.