Authorities probe motive in Nevada IHOP shooting

CARSON CITY, Nev. — A gunman wielding an AK-47 opened fire on a table of uniformed National Guard members at an IHOP restaurant on Tuesday in an outburst of violence that killed four people, wounded eight others and put Nevada's capital city on high alert as the shooter unloaded his assault rifle in a bustling business district.

The shooter's motive was unclear, but family members said he had mental issues. He had never been in the military and had no known affiliation with anyone inside the restaurant.

AP Photo/ The Reno Gazette Journal, David B. Parker

Police investigate the outside the scen...