New York ? An attorney for victims of the 1993 World Trade Center bombing closed his case Tuesday saying the building’s owners failed to take steps to thwart a possible terrorist assault.

Lawyer David J. Dean represents more than 400 people who say the Port Authority, which owned and operated the trade center, negligently failed to heed its own security officers who warned that the 400-car public parking garage under the 110-story twin towers wasn’t secure.

Marc Kasowitz, a lawyer for the Port Authority, said that nothing would have deterred resourceful, determined terrorists from finding a way to unleash an attack.

The bombing killed six people and injured more than 1,000 on Feb. 26, 1993, when terrorists detonated nearly 1,500 pounds of explosives in a rented van.

If the Port Authority is found liable, separate trials will be held to determine money damages.