Taliban suicide bombers and gunmen struck three government sites in the Afghan capital Kabul Wednesday. At least 20 people were killed. The attack came on the eve of a visit to Kabul by U.S. special envoy Richard Holbrooke. He's in the region to help establish the Obama administration's new policy in Afghanistan. Richard Oppel Jr., a reporter with The New York Times, tells Renee Montagne Afghan officials have locked down the city.