Afghan police say a suicide attack has taken place outside the Iraqi embassy in the capital, Kabul.
Gunfire was heard following several explosions in the central Shar-e-Naw neighbourhood.
Security forces are said to be battling gunmen. Civilians are being evacuated from the area.
So-called Islamic State said it carried out the latest attack. Kabul has seen a number of deadly assaults this year blamed on either IS or the Taliban.
Security officials said a suicide bomber targeted the area housing a police headquarters and the Iraqi embassy compound. Several other attackers appear to have entered the embassy building.
Pictures on social media show black plumes of smoke rising into the sky.