Carlos Mancilla , 26 , shot to death as he sat in his car with two others . One of the other men was the target , police say . Threats exchanged over the Internet , and a plot was hatched , police say . MIAMI , Florida ( CNN ) -- Four men in custody ; police executing search warrants .
Carlos Mancilla , 26 , shot to death as he sat in his car with two others . One of the other men was the target , police say . Threats exchanged over the Internet , and a plot was hatched , police say . Four men in custody ; police executing search warrants .