Outlawed Kurdish PKK militants have claimed the attack on a Turkish defence firm that killed five, with officials saying the perpetrators infiltrated from Syria and carried out a shooting and suicide attack.

At least 27 civilians were killed in northern and eastern Syria in a 24-hour military escalation, according to a war monitor, as Turkey struck suspected Kurdish militant targets in Iraq and Syria for the second day.

Turkey launched fresh air strikes on Kurdistan Workers Party (PKK) militants in northern Syria and Iraq overnight, killing 59 militants, in response to a gun attack that killed five people in Ankara,