flags at the u.s. capitol and the white house are flying at half-staff at this hour after another capitol police officer was killed in the line of duty. the violent confrontation began midday friday when the suspect rammed a car into a security barricade. police say the driver then lunged at officers with a knife, stabbing one of them before he was fatally shot. another officer was also wounded. officer william evans is the second capitol officer to die on duty since the capitol riot. his college roommate spoke to affiliate wbz. it was real surreal to think that i i mean i literally just talked to him and we shared a laugh a couple of days ago, and now he s gone. it has just been shock ever since. i mean it s been fighting back tears all afternoon and trying to trying to make sense of it all and knowing that there s none to be had. for the latest on what we know, here s cnn s brian todd. reporter: a suspect in a car rammed two capitol police officers at the security
watching. i m kim brunhuber. this is cnn newsroom. for the second time this year a capitol police officer has been killed in the line of duty. flags at the u.s. capitol and the white house have been lowered to half staff to mourn his death. the violent confrontation began midday friday when the suspect rammed a car into the security barricade. police say the driver then lunged at officers with a knife, stabbing one of them before he was fatally shot. another officer was also winded. cnn s jessica dean has the latest. reporter: the united states capitol on high alert again as another attack left one capitol police officer dead and another injured. the suspect rammed his car into two of our officers. reporter: and 25-year-old suspect noah green, rammed this green sedan into a barricade at the capitol building before striking two officers, before exiting that vehicle and charging at the officers with a knife. the suspect did start lunging toward u.s. capitol police off