It’s been a tumultuous day in Turkey.

In the midst of a near-nationwide blackout that grounded planes and froze rail traffic and which officials say could be terror-linked, armed gunman have taken a prosecutor hostage in an Istanbul court house. The prosecutor, Mehmet Selim Kiraz, is in charge of the investigation into the death of a 14-year old boy who died after being hit in the head by a tear gas canister in 2013 amid widespread protests. Here’s more via BBC:

A banned Marxist revolutionary group is suspected of being behind the incident.

A statement posted online said the prosecutor would be killed if their demands were not met.

Berkin Elvan, who was then 14, was struck in the head by a police tear gas canister in June 2013 as he went to buy bread during mass demonstrations that began in Istanbul and spread across Turkey.

After nine months in a coma he eventually died in an Istanbul hospital.

Recep Tayyip Erdogan, now Turkey's president, inflamed passions shortly after the teenager's death when he said the boy had been carrying a slingshot and had been "taken up into terrorist organisations"...

Suspected members of the Revolutionary People's Liberation Party-Front (DHKP-C) took the prosecutor hostage on the sixth floor of the Caglayan court house, reports said.

A website close to the group has published a series of demands, including calls for an immediate confession from police officers responsible for the boy's death, and for an end to prosecutions of protesters charged over the clashes.