Assad’s crackdown on six months of pro-democracy protests has envenomed relations with the United States, which has imposed fresh sanctions and rallied world pressure on Syria.
President Barack Obama took office in 2009 pledging to engage in dialogue with Damascus and named Ford as ambassador.
“Two embassy cars were damaged,” said a witness, who asked not to be identified, adding that the demonstrators were chanting “Abu Hafez (father of Hafez),” a nickname for Assad.
The diplomats were visiting Hassan Abdelazim, a centrist politician who has demanded an end to Assad’s crackdown as a condition for any opposition dialogue with the president.
Ford was already inside the building when about 200 Assad supporters attacked the embassy vehicles with large rocks and street signs with concrete bases.
Embassy staff inside the vehicles were not harmed. Police later extracted the convoy.