ARLINGTON, Va. - The Sept. 11th attack on the Pentagon was the deadliest foreign attack on the government since the War of 1812, and officials are working throughout the morning to honor the victims 20 years later.The day of remembrance began with the unfurling of a large American flag on the side of the Pentagon at sunrise.FOX 5's Bob Barnard captured the somber scene:Guests are expected to arrive at the 20th anniversary event around 8 a.m.At 9:05 a.m., officials will read the names of the 189 people killed in the 9/11 Pentagon attack.