The three hostages were released unharmed after the attacker gave himself up to police.Turkish media said the assailant was a colleague of the 37-year-old victim Naci Sahin at the offices in the Aegean province of Muğla, near the popular resorts of Bodrum and Marmaris.The shooting occurred on Friday morning during a meeting of regional social security officials.The motive for the attack was not clear.