De Salis , a British oil executive , and Howie , a citizen of New Zealand , were killed in the attack .
Gunmen opened fire on Mark De Salis and lynn Howie as they ate lunch on a beach in near Sabratah town , Zawiya district , Libya .
Mark De Salis   , a British oil executive , and lynn Howie , a citizen of New Zealand , were killed in the attack .
Gunmen opened fire on Mark De Salis and lynn Howie as they ate lunch on a beach in near Sabratah town , Zawiya district , Libya .