A suicide bomber has attacked the US embassy in the Turkish capital Ankara, killing a guard, officials say.
The blast, at a side entrance of the heavily guarded compound, sent debris flying into the street.
The US has warned its citizens not to visit diplomatic missions in Turkey until further notice.
No group has said it carried out the attack, but Interior Minister Muammer Guler said the bomber, who also died, was a far-left militant.
Mr Guler suggested that the bomber might have been a member of the outlawed Revolutionary People's Liberation Party-Front.
He also said the attacker was believed to have been a Turkish national.
Continue reading the main story At the scene
Golnar Motevalli Ankara
The police moved quickly to create a barricade a few metres from the site of the blast. They have cordoned off the area with bright yellow tape, and crowds of officers are still at the scene. Throngs of reporters and camera crews have been pushed back down the street by the police officers.
The embassy is in a district that is home to several diplomatic missions, as well as affluent residential areas, shops and restaurants. Worried residents have been passing by, trying to find out what has happened. The owner of a travel agent across the road from the embassy said he had seen the body of the attacker being lifted into the back of an ambulance.
It is still unclear who carried out the attack, but the Turkish capital has been hit by suicide bombings in the past. The last attack was in September 2011, and was blamed on Kurdish militants.
Turkey and the US have denounced the incident as terrorism.
Ankara was last hit by a suicide bombing in September 2011, in an attack blamed on Kurdish militants.
A number of illegal groups ranging from Kurdish separatists to leftist and Islamist militants have launched attacks in Turkey in recent years.
'Terrorist elements' US ambassador Francis Ricciardone briefed reporters outside the embassy shortly after the attack.
He said a guard at the embassy's side entrance had been killed in the blast at 13:15 (11:15 GMT), and a Turkish citizen had been wounded.
Turkish officials said the bomber had also died.
Other reports said three people were injured, one of them seriously.
Witnesses said a woman with her face covered in blood had been taken away in an ambulance.
The explosion blew the door off the entrance checkpoint and sent debris flying into the street.
Prime Minister Recep Tayyip Erdogan made a televised statement in which he called for a global effort to combat "terrorist elements".
The US state department said it was working with the Turkish police to make a full assessment of the damage.

US ambassador Francis Ricciardone told reporters the situation was "very sad"
The owner of a travel agency opposite the embassy said he had seen a body being removed by ambulance. His agency's windows were blown out by the blast.
The area around the embassy was swarming with police, said journalist Golnar Motevalli in Ankara.
While the blast was very loud, she added, the damage seemed to have been limited to the vicinity and no smoke was visible afterwards.
The embassy building is heavily protected but the US has had long-standing plans to move its compound elsewhere for security reasons.
It was recently reported to be in the final stages of a deal to choose an alternative location.
The German and French embassies are situated close to the current building.