UPDATE 2-Airport shooting reignites security debate before French election
* Man shot dead said he was there to "die for Allah"
* Three family members released in investigation
* Father denies son a terrorist, autopsy shows drugs
* Election candidates express alarm at airport incident (Adds judicial source on autopsy showing drugs)
By Yann Le Guernigou and Gus Trompiz
PARIS, March 19 (Reuters) - Police questioned and then released relatives of a man shot dead at a Paris airport, as investigators sought clues on why he attacked an army patrol in an incident that has pushed security to the forefront of France's election campaign.
Paris prosecutor Francois Molins said late on Saturday that the man, named as 39-year-old Ziyed Ben Belgacem, had shouted he was there to "die for Allah" when he tried to seize a gun from a woman air force member on patrol at Orly airport.
After throwing down a bag containing a can of petrol and putting an air pistol to the head of the soldier, he was shot three times by her colleagues.
More than 230 people have died in France in the past two years at the hands of attackers allied to the militant Islamist group Islamic State, making security a key issue in the two-round presidential election on April 23 and May 7. Continued...