Dallas shootings gunman had bomb-making materials and rifles at his home

An Army veteran killed by Dallas police after he fatally shot five officers amassed a personal arsenal at his home, including bomb-making materials, bulletproof vests, rifles, ammunition and a journal of combat tactics.

The man identified as 25-year-old Micah Johnson told authorities he was upset about the fatal police shootings of two black men earlier this week and wanted to exterminate whites, "especially white officers," officials said.