The sisters who died on the Meadowbrook State Parkway en route to work as counselors at a special-needs camp were not wearing their seat belts during last week's crash, State Police said Thursday.

The Floral Park sisters, Paige Malone, 19, and Jamie Malone, 22, along with Michael Mulhall, 22, were killed on July 15 when the car in which they were passengers struck a tree on the parkway, said Trooper Frank Bandiero, a spokesman for the New York State Police.

In the impact, the older sister was ejected from the vehicle, authorities said.

How fast the 2010 Honda Civic was traveling when it struck the tree, the path it traveled and what the two survivors told investigators are among the unanswered questions that the State Police's Collision Reconstruction Unit will provide answers to, authorities said.

Investigators have ruled out alcohol and drugs as factors in the fatal crash, he said.

Their reconstruction report, to be written by investigators and troopers based at the Farmingdale-headquartered Troop L, could take weeks to complete and make public, Bandiero said.

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The five young people riding in the Honda that Thursday morning were headed to Camp Anchor in Lido Beach, a town-owned beachfront program that serves nearly 700 special-needs campers. Hundreds work there as volunteers and staff.

The Honda, being driven by Michael Mulhall's sister Justine, 20, was on the Meadowbrook just south of the Southern State Parkway when the car crossed to the right lane, onto the shoulder and struck the tree at 8:50 a.m.

Investigators determined that Michael Mulhall was seated in the front passenger seat, survivor Kelly Murphy, 20, was seated behind the driver, Paige Malone was sitting in the right rear seat and Jamie Malone was sitting in the center of the car, Bandiero said in an interview. Except for the sisters, the other passengers were all buckled, he said.