Four people were tied up and assaulted inside a Teaneck home Friday by gun-toting robbers who broke in through a rear door, according to police. Police received a 911 call about 3 p.m. reporting a home invasion in progress in the 100 block of Tyron Avenue, Teaneck police said in a news release. “Police on scene located four adult victims who had been assaulted and restrained against their will while inside the residence,” Teaneck Police Chief Andrew R. McGurr said in a statement. McGurr said two of the robbers were carrying firearms. The men bound and assaulted the victims while stealing perso…