Saudi Arabia . `` I want on behalf of our country to say to those who were wounded , and certainly to the families of those who were killed , that our condolences are with them , '' she added . It was not clear whether the blast was caused by a suicide attack or by a remotely detonated car bomb . A communique issued by the U.S. Embassy in Beirut said the embassy vehicle was apparently the intended target of the attack , and identified the driver and passenger as Lebanese security personnel for the embassy . But McCormack cautioned against jumping to any conclusions on the intended target . `` We do n't yet have a full picture of exactly what happened , who is responsible , who is exactly being targeted , '' he told reporters during the State Department 's daily briefing . `` We will see over the next day or two ... where the facts lead us . '' Citing security concerns , McCormack would also not address unconfirmed reports that the vehicle was part of a convoy for departing U.S. Ambassador to Lebanon Jeffrey Feltman . A U.S. Embassy statement said Feltman canceled
BEIRUT , Lebanon -LRB- CNN -RRB- -- A car bomb struck a U.S. Embassy vehicle Tuesday as it traveled along a coastal highway north of Beirut , killing at least three Lebanese civilian bystanders , according to American and Lebanese officials . Lebanese soldiers and Red Cross workers stand near charred cars at the site of the explosion in Beirut . The driver of the embassy vehicle suffered minor injuries , and the sole passenger walked away unscathed , U.S. State Department spokesman Sean McCormack said . Both were Lebanese nationals , he said . An American citizen who happened to be in the area suffered non-life-threatening injuries , the spokesman said . Lebanese internal security forces said three Lebanese civilian bystanders were killed in the explosion in Beirut 's Dora area , contradicting earlier reports of four . Twenty-one others -- including the American bystander -- were wounded in the explosion , which was caused by a 15-kilogram -LRB- 33-pound -RRB- bomb placed in a car before the explosion , the security forces said . The United States is outraged by the terrorist attack , said Secretary of State Condoleezza Rice , who is traveling with President Bush in