400 pounds of blasting material taken from storage depot in New Mexico... Four men, including two brothers, were taken into custody Friday by federal authorities ... Federal authorities have said it was enough to flatten a large building... said Tom Mangan, a spokesman for the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal authorities were processing a crime scene... 150 pounds of C-4, 250 pounds of sheet explosives, 20,000 feet of detonator cord and 2,500 blasting caps. This breaking news story will be updated.