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Police have detained a gunman who entered the office of Turkey's ruling AK Party in Istanbul after he smashed top floor windows and hung out a flag.
Private Dogan news agency initially reported two armed intruders entered the AK Party office.
The security threat occurred a day after a prosecutor in the city was shot dead as police tried to free him from hostage-takers.
Police are attending the offices of Turkey's ruling AK Party in Istanbul after two armed people were reportedly seen entering the building, a day after a prosecutor died having been taken hostage in the city.
Reuters, citing the private Dogan news agency, said several police cars were outside the building in the Kartal district with the road sealed off.
Prosecutor Mehmet Selim Kiraz yesterday died after being injured in a stand-off at a courthouse in the city.
Two of his captors, who were from a far-left group, were killed after security forces stormed the building.
The Turkish Foreign Minister has said on Twitter that the prosecutor injured in a hostage standoff has died.
The prosecutor was critically injured and two of his captors were killed after security forces stormed the courthouse where a far-left group had taken the prosecutor hostage, Istanbul's police chief said.
Turkish President Tayyip Erdogan said Mehmet Selim Kiraz had been shot three times in the head and twice in the body. Kiraz was leading an investigation into the death last March of 15-year-old Berkin Elvan, who died after nine months in a coma from a head wound sustained in anti-government protests.
The leftist group DHKP-C said on its website it wanted the police officer it blames for Elvan's death to confess on television, the officers involved to be tried in "people's courts", and charges against those who attended protests for Elvan to be dropped.
Two members of a banned left-wing group who held a prosecutor hostage in his office inside a courthouse in Istanbul have been killed in a shootout with Turkish police.
Istanbul police chief Selami Altunok said the prosecutor was seriously wounded, and he has been taken to hospital.
Police had negotiated with the gunmen for six hours before the violent end to the hostage situation, Altunok said. It was not clear how the assailants sneaked the arms into the courthouse.
A far-left Turkish group have taken an Istanbul prosecutor hostage and threatened on its website to kill him.
The Revolutionary People's Liberation Party-Front (DHKP-C) published a picture of the prosecutor with a gun to his head, prompting special forces officers to enter the courthouse as people inside the building were evacuated.
The prosecutor is leading an investigation into the death last year of a teenager, Berkin Elvan, wounded during anti-government protests in June 2013.
Television footage showed special forces officers entering the building.
More: Police crackdown in Turkey (16 June, 2013)