LAS VEGAS, Nevada (KTRK) -- A group of three suspects violently pushed an elderly man to the ground and then began to beat him up, according to authorities.The incident happened in Las Vegas as the 78-year-old man was getting out of his car to eat at a Mexican restaurant.The trio stole the man keys and other belongings before taking off.Authorities believe they have the suspects in custody, but are waiting for the victim to identify the men.