D.C. National Guardsmen shooting was an ambush attack, federal law enforcement sources say

Wednesday's shooting of two National Guardsmen in Washington, D.C., was an ambush attack, two federal law enforcement sources tell CBS News. Lindsey Reiser anchored CBS News' coverage. Editor's note: West Virginia Gov. Patrick Morrisey said there were "conflicting reports" about the conditions of the two National Guard members, after earlier saying the two had been killed.