There was a small amount of debris at the site of the explosion, which occurred around 1pm. Local time (1 am ET) on Thursday. An area outside the embassy in the Chaoyang district of the Chinese capital is still closed by the authorities.
"There was one person who detonated a bomb, except for the bomber, there were no injuries, and the local police responded," The US Embassy spokesman in a statement.
Many social media users in the Chinese capital published videos showing a large white cloud of smoke from the area around the embassy.
Beijing police said they were investigating the explosion on Thursday, adding that the bomber had just injured his hand and his condition was not life threatening.
"He is in the hospital and no one was injured, his last name is Jiang, 26, from Inner Mongolia, and the case is under investigation" (19659002) The US Embassy was not mentioned in the police statement. Most mentions of the explosion have been severely censored and removed from China's Weibo social media site, including a large number of personal reports.
During his daily press conference, State Department spokesman Geng Shuang said the explosion was an "isolated security incident." "The Chinese police have dealt with it in a timely and proper manner," he told journalists.
The US Embassy in Beijing is one of the safest in the world, with cutting-edge technology and a strong security presence.  History of development, more will follow