Iraqi Kurdish Peshmerga fighters have crossed the Turkish border to help defend the Syrian town of Kobane from Islamic State.
Sources inside the town told BBC Arabic the unit was heading to the frontline about 4km west of Kobane.
Turkey finally authorised the Iraqi Kurds to cross the border last week.
Kobane has been under siege for six weeks in a battle that has left 800 dead and forced more than 200,000 to flee across the Turkish border.
Some 150 Peshmerga fighters had mustered at a holding station about 8 km (5 miles) from Kobane three days ago and on Friday set off towards the town in a dozen jeeps, escorted by armoured vehicles.