The charges were dropped despite authorities a finding a tub with more than 100 pounds (45 kilograms) of explosive materials and later receiving warnings from other relatives that suspect Anderson Lee Aldrich was sure to hurt or murder a set of grandparents if freed, according to the documents, which were unsealed Thursday.The case included allegations that Aldrich threatened to kill the grandparents in a chilling confrontation during which the suspect described plans to become the “next mass killer” more than a year before the nightclub attack that killed five people.The documents describe how Aldrich told the frightened grandparents about firearms and bomb-making material in the grandparents’ basement and vowed not to let them interfere with plans for Aldrich to be “the next mass killer” and “go out in a blaze.” Aldrich — who uses they/them pronouns and is nonbinary, according to their attorneys — holed up in their mother’s home in a standoff with SWAT teams and warned about having armor-piercing rounds and a determination to “go to the end.” Investigators later searched the mother’s and grandparents’ houses and found and seized handguns, hundreds of rounds of ammunition, body armor, magazines, a gas mask and a 12-gallon tub with explosive chemicals.The tub had bags with an estimated 113 pounds (51 kilograms) of ammonium nitrate and packets of aluminum powder that are explosive when combined, the documents show.“At the end of the day, they weren’t going to testify against Andy,” Xavier Kraus, a former friend and neighbor of Aldrich, told the AP."