Aaron Alexis, the man police say shot and killed 12 people in a Washington Navy Yard, reportedly called police to complain about people following him and that he was hearing voices. He sought mental health treatment from a nearby VA hospital, officials said. NBC's Pete Williams reports.
Here's a snapshot of some of the top stories we're following Tuesday evening:
D.C. Navy Yard gunman practiced with AR-15 at Virginia range — two days before rampage
Aaron Alexis, the Washington Navy Yard shooter, rented an AR-15 semi-automatic rifle and used it for target practice at a Virginia gun range and store less than two days before his horrific shooting spree, according to a lawyer for the store. Read more at NBC News.
... And he was so unhappy with his life in America, he was "ready to move out of the country"
Hit hard by money troubles and feeling slighted as a veteran, Alexis was "ready to move out of the country" last year and "tired of dealing with the government," a friend said Tuesday. Read more at NBC News.
Obama orders thorough review of security procedures at Navy sites
President Obama has directed his Office of Management and Budget to inspect security standards for contractors and employees across federal agencies — a move that comes in the wake of the mass shooting at the Navy Yard, which raised concerns about protections at U.S. military installations. Read more at NBC News.
Brain-eating amoeba may be tied to Katrina
School administrators in an area near New Orleans have turned off water fountains and stocked up on hand sanitizer this week after a rare and lethal brain-eating amoeba killed a 4-year-old boy and was found thriving in the local tap water system. Some experts are pinning the blame on water systems devastated by Hurricane Katrina in 2005. Read more at NBC News.
14-year-old Georgia girl abducted by armed robbers
Authorities are hunting for two gunmen who kidnapped a Georgia girl, 14 after a home invasion robbery. Ayvani Hope Perez is believed to be "in harm's way," police said Tuesday afternoon. Read more at NBC News.
Experts: Fateful convergence of geography, climate triggered Colorado floods
The monstrous torrent of water that gusher over and down the Rocky Mountains last week was the product of a cross between geography and weather, experts said. Although the exact role of global climate change in the deluge is unclear, it certainly played a part, they said. Read more at NBC News.
Electrical components hit by Sandy floodwaters caused NJ boardwalk blaze
A boardwalk fire that tore through two Jersey Shore communities was caused by electrical components that had been compromised by Superstorm Sandy last year, officials announced Tuesday. Read more at NBC News.
Texas town in shambles after middle school football player dies from ants attack during game
Parents and a school district official were aghast and distraught after a 13-year-old Texas boy died four days after he suffered a severe allergic reaction to ant bites during a football game. Read more at NBC News.