GRAND RAPIDS, MI (WHTC) - Federal investigators yesterday began presenting evidence that led to a series of raids around Holland last Friday targeting gang-related activity. The testimony came during a detention hearing for Nicholas Bernal, Ramon Gaytan Junior, Francisco Martinez Junior and Ramon Morales; that hearing will resume tomorrow. They are four of at least seven persons with alleged ties to the Holland Latin Kings gang arrested on weapons-related charges in a multi-jurisdictional operation that authorities say are still ongoing.