A suspected suicide bomber detonated an explosive device at the entrance of the US Embassy in the Turkish capital on Friday and at least two people are dead, a police official said.
An Associated Press journalist saw a body in the street in front of an embassy side entrance.
The bomb appeared to have exploded inside the security checkpoint at the entrance of the visa section of the embassy.
Several ambulances were dispatched to the area. At least one woman who appeared to be seriously injured being carried into an ambulance.
According to Turkish broadcaster NTV, the explosion caused no damage inside the embassy.
The police official spoke on condition of anonymity in line with government rules. The phones were not being answered at the embassy.
The embassy building is heavily protected. It is near an area where several other embassies, including that of Germany and France, are located.
There was no claim of responsibility, but Kurdish rebels and Islamic militants are active in Turkey. Kurdish rebels, who are fighting for autonomy in the Kurdish-dominated southeast, have dramatically stepped up attacks in Turkey over the last year.