Investigators believe that Micah Johnson, the former Army reservist who killed five people in Dallas on Thursday night, was planning a larger attack but moved up his plan in response to the police shootings of Alton Sterling and Philando Castile. “We think he was probably planning something bigger based on what we found at the house with the explosive materials,” said a law enforcement source with knowledge of the investigation. “He had a bunch of explosive materials. He didn’t have the explosives created.”
