Updated: 7:56 p.m. Capitol Police arrested a man who drove up to the Capitol on Tuesday afternoon with a rifle in his blue pickup truck. Alfred Brock, a 64-year-old from Winnfield, La., drove up to the Capitol’s north barricade at about 4 p.m. and he told officers he had a delivery for President Barack Obama, police spokeswoman Sgt. Kimberly Schneider said. After officers questioned him further, he admitted he had a rifle in his truck. The Capitol Police’s Hazardous Devices Unit was called to the scene, and “out of an abundance of caution,” officers searched and cleared the truck. In it, they found several rounds of ammunition. The arrest and subsequent search caused some commotion, as photographers waited to get a shot of White House Chief of Staff Rahm Emanuel arriving at the Capitol. Instead, some turned their cameras toward the unfolding arrest. By 6 p.m., the scene was cleared and officers reopened the Capitol’s north barricade. Some of those exiting the Capitol weren’t even aware an arrest occurred at all. Brock has been charged with possession of an unregistered firearm and possession of unregistered ammunition.