Chinese state media say three people have died after a vehicle crashed in Tiananmen Square in the capital, Beijing.
Eleven other people, including tourists, were injured in the incident, Xinhua news agency said.
The square was evacuated after the vehicle “went into the crowd in front of the Tiananmen rostrum” at midday, the agency said.
Images posted online showed a vehicle in flames, amid barricades.
Other pictures on social media showed a column of smoke rising from the scene of the crash.
There has been no explanation so far about the cause of the crash.
Tiananmen Square was the scene of the 1989 pro-democracy protests which were ended by a military crackdown.
The site is generally kept under very tight security both because of its proximity to key political institutions and so that is does not serve as a hub for protesters and petitioners.
Incidents do occur, nonetheless. In 2011, a man set himself on fire at Tiananmen Square following what officials said was a legal dispute, close to the square’s portrait of Chairman Mao.
In 2000, several members of the banned Falun Gong spiritual movement were arrested for protesting at the square.
Fire extinguishers can be found at the site, and have been used when protestors set themselves on fire.
‘Bursting into flames’
The incident took place at the north end of Tiananmen Square, near an entrance to the Forbidden City.
“A driver and two passengers were killed after a jeep crashed into a crowd of people and caught fire,” Xinhua news agency said.
“Eleven tourists and police officers were also injured by the jeep, which crashed into a guardrail of Jinshui Bridge on the moat of the Forbidden City before bursting into flames at 12:05 pm,” it said, citing police and emergency officials.
The fire was quickly put out and the injured sent to hospital, it said.
A subway station close to the square was temporarily closed at the request of police, Beijing transport authorities said. Police also closed the road near the crash.
News of the incident first appeared on social media from those who were at the scene, but it appeared that some pictures were being quickly removed.
A BBC team that went to the site to gather footage said that they were detained for around 20 minutes before being released.
AFP news agency said that two of its reporters were also held close to the square, with images deleted from their cameras.
Chinese Foreign Ministry spokeswoman Hua Chunying, when asked whether the government believed the incident was a terror attack, said that she did not know the specifics of the case and declined further comment, Reuters news agency reported.