Three siblings from Texas , another man , went missing in Mexico on October 13 . An FBI spokeswoman said the agency is assisting Mexican officials with any part of the investigation on the U.S. side of the border . Some witnesses say security forces took them . Comment: They were buried Sunday in Mexico .
Three siblings from Texas , another man , went missing in Mexico on October 13 . Some witnesses say security forces took them . Comment: They were buried Sunday in Mexico .