Halloween is a busy time on the border as hundreds of children from Mexico wearing costumes come across international bridges to trick-or-treat.
The casino is about a 15 minute drive south of the border.
Dragged behind cars and left for dead, two dogs are in guarded condition with road rash and severe injuries in two separate animal cruelty cases.
Tamaulipas state investigator Raul Galindo Vira would only confirm that four bodies had been recovered and declined to discuss who they might be.
The Dallas Zoo has a new giraffe with the birth of a healthy male calf.