TUNIS A Tunisian military doctor seeking to retrieve his son who had joined Islamic State in Syria was among those killed in Tuesday's suicide attack by militants at Istanbul airport, a security sources said on Wednesday. Three suspected Islamic State suicide bombers opened fire and blew themselves up in Istanbul's main airport on Tuesday evening, killing 41 people and wounding 239 in the deadliest in a ****** of suicide bombings this year in Turkey. The Tunisian Defence Ministry confirmed that Brigadier General Fathi Bayoudh, a military hospital doctor, was among those killed.