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.

Five people have been killed in an apparent terror attack in Turkey at the headquarters of a defence and aerospace company. Turkey has blamed Kurdish militant group the PKK for the attack and has launched strikes on its sites in Syria and Iraq.

Turkey struck suspected Kurdish militant targets in Syria and Iraq for a second day on Thursday following an attack on the premises of a key defense company that killed at least five people, the state-run news agency reported.