all right. new in the last hour cnn learned a second suspect has been arrested in connection with a kansas man s plot to bomb a u.s. army base. the justice department says alexander blair, 28 knew about 20-year-old john booker s plan to detonate a car bomb at ft. riley, but didn t report it. meanwhile, booker also known as muhammad abdela hasan is charged with attempting to use a weapon of mass destruction, attempting to damage property by means of an explosive, and attempting to provide material support to isis. the fbi says it was booker s facebook posts that first got their attention last year. cnn s evan perez has more. reporter: a 20-year-old american man was arrested as he prepared to carry out what he thought was a suicide bombing at ft. riley army base in kansas. john t. booker enlisted last year in the army. but the army cancelled his enlistment before he showed up for basic training. that s after the fbi says it found facebook postings claiming he wanted to carry out jihad