A fire or possible explosion appears to have taken place outside the US embassy in Beijing, amid reports by official media that a woman was detained after spraying gasoline on herself.
Photos posted on Twitter on Thursday showed a large amount of smoke and what appeared to be police vehicles surrounding the vast structure in northeastern Beijing.
Police did not immediately respond to requests for comment on the incident and an embassy spokesman said he was still collecting information.
The ruling Communist Party newspaper Global Times said police "took away a woman spraying gasoline on herself in suspected attempt at self-immolation".
China and the US are in the middle of a trade dispute but America remains a hugely popular destination for travel, education and immigration for Chinese citizens.