reporter: a family member says ten miles down the road the gunman opened fire on two other vehicles that were following miller s car. dawna langford, her two year old and 11-year-old children were killed. langford s aunt trish cloes. it s something that you can t explain how there are evil people in this world that can do something like that. reporter: during the gunfire, christina langford johnson hid her baby in the backseat. she left the vehicle with her hands up to plead with the gunman to stop shooting. witnesses say she was gunned down in cold blood. five other children were wounded. three more were uninjured. mexican authorities arrived at the scene and transported some of the wounded to area hospitals. all the victims were members of a breakaway group of mormon fundamentalists. they settled in the mountains of sonora, mexico, decades ago. on twitter president trump urged mexico s president to accept u.s. assistance to eradicate the drug cartel. he wrote, this is the time