Gunman storms ruling AK Party Istanbul offices

Police detained a gunman who stormed an office of Turkey's ruling AK Party in an Istanbul suburb on Wednesday, the private Dogan news agency said, a day after a prosecutor in the city was shot dead in a previous incident on Tuesday as police tried to free him from hostage-takers.

The man smashed windows on the top floor of the building in the Kartal district on Istanbul's Asian side and hung out a flag before being detained.

Footage from the scene showed the intruder emerging from a broken window on the top floor, as a large number of police cars were deployed in the street outside. The man could be seen addressing onlookers after flying a Turkish flag with a sword on it.

He had previously demanded that all those inside the building should leave, local media reported.

It was not immediately clear whether a second gunman was involved, as suggested by earlier reports.

The incident occurred as judges and lawyers congregated in a courthouse on the European side of the city to mourn prosecutor Mehmet Selim Kiraz, who was tasked with investigating the death of a young protestor killed by a tear gas canister during demonstrations in 2013.

He was killed by two hostage takers during an attempt by police special forces to rescue him Tuesday.

The two hostage-takers - members of the banned far-leftist Revolutionary People's Liberation Party-Front (DHKP-C) - were also killed in the rescue effort.

It is not yet clear if the two incidents are linked to one another.