EDISON - Terminal 3 has reopened at Los Angeles International Airport as investigators continue to dig into what prompted a former New Jersey resident to shoot and kill a TSA agent on Friday.

Police say 23-year-old Paul Ciancia, a Pennsville native, was armed with a semi-automatic rifle when he opened fire at LAX yesterday morning. The TSA agent who was killed has been identified as 39-year-old Gerardo Hernandez, the first TSA agent in history to be killed in the line of duty, according to officials.

Many residents in New Jersey are wondering now what could have been done to prevent or stop Ciancia's rampage.

Isaac Yeffet, the former head of security for Israel's El Al airline, and retiree from the Israeli Secret Service, said yesterday's shooting at LAX shows how airports should have better trained staff.

"We need to start having qualified people, to bring professional people to be able to train people, the qualified people to do lots of exercises, to let the people understand that you come to work and it's not a regular job," says the Cliffside Park resident, who has worked for airlines across the country as a security consultant.

Yeffet says he is not against the TSA, but he just says security overall is lacking. He says there doesn't need to be a checkpoint outside the ticket counter, but he does suggest that some TSA agents are armed inside terminals.

A local TSA agent and union Vice President for Newark, JFK and LaGuardia airports told News 12 that officers are trained for "active shooter" situations.