Expanding on earlier headlines (see 'TURKEY: Reports Of Gunfire, Explosion Heard At Turkish Aviation Company", 1416BST), Turkey's Interior Minister Ali Yerlikaya said in an online statement  "A terrorist attack was carried out against the Turkish Aerospace Industries Inc. (TUSAŞ) Ankara Kahramankazan facilities. Unfortunately, we have martyrs and injured people following the attack,". At the time of writing it remains unclear who the perpetrators are. Turkey has experienced numerous terrorist attacks in the past from groups including the Kurdish separatist Kurdistan Workers' Party (PKK) and its military wing the People's Defence Forces (HPG), Islamist extremists from the Islamic State and Al Qaeda, and far-left revolutionaries. 

• Ruslan Trade at the Atlantic Council think tank: "Haberturk TV said there was an ongoing “hostage situation” without giving further details. The blast occurred as a major trade fair for the defense and aerospace industries was taking place in Istanbul."
• Politico reports "The company runs maintenance on Turkey’s fleet of old F-16 fighter jets and sells its own systems, from military aircraft under its own TF-X program to training aircraft such as the Hürkuş while it also pitched a multirole helicopter at international air shows this year."