US-ATTACKS-DEFENSE

The scaffolded US Capitol is seen at sunset as a US Capitol Police K-9 Officer takes his dog on patrol October 28, 2014 in Washington, DC. US Homeland Security officials announced October 28, 2014 that enhanced and undisclosed security would be enacted at locations in the US. The US Capitol dome will undergo its first comprehensive repairs in more than half a century this autumn, installing a donut-shaped canopy to protect visitors to the historic structure. The two-year, USD 60 million project is aimed at repairing nearly 1,300 cracks that have emerged in the nine-million-pound (4.1-million-kilogram) cast iron dome, according to the Architect of the Capitol (AOC) office. Construction on the dome began in 1855. Work symbolically continued through the US Civil War and the structure was eventually completed in 1866. AFP Photo/Paul J. Richards (Photo by Paul J. RICHARDS / AFP) (Photo by PAUL J. RICHARDS/AFP via Getty Images)