Dallas Mayor Mike Rawlings says authorities believe 25-year-old Micah Johnson was the lone shooter in the attack that killed five police officers and wounded seven others, the AP reports. Johnson was killed following a standoff with police. Rawlings made his comments Friday in response to questions about initial police reports about possible other suspects. He said the crowd at Thursday's protest included about 20 people carrying rifles and wearing protective gear. He says that like others, they started running after the shooting began. He said authorities started stopping them and interviewing them. Rawlings says authorities later concluded that the "shooting came from one building at different levels from one suspect" and that the other people they'd stopped weren't involved.
Dallas police say Johnson had bomb-making materials, ballistic vests, rifles, ammunition, and a personal journal of combat tactics at his home. They also say that people they interviewed have described him as a loner. Police say detectives are in the processing of analyzing the information contained in the journal. Dallas Police Chief David Brown says Johnson said he was angry about the recent killings by police of black men in Louisiana and Minnesota and that he wanted to kill whites, particularly white officers. Homeland Security Secretary Jeh Johnson said Micah Johnson doesn't appear to have had any known "links to or inspiration from any international terrorist organization." (Read more Dallas police shooting stories.)