NASHVILLE, Tenn. (AP) _ A video being shot in Nashville this week will help train emergency workers across the nation for what once seemed a remote possibility: civilians under attack by terrorists.

The production was planned over a year ago, but Nashville emergency workers participating in the filming say the Sept. 11 terrorist attacks brought its importance home.

``Before, it was just a possibility. Now it's a fact of life,'' said Mitch Fuhrer, a Nashville police officer in the video.

Emergency Film Group, a Massachusetts-based company, is making two terrorism response training tapes through a grant from the Justice Department's Domestic Preparedness Program.

The videos, to be distributed this year, teach emergency organizations how to work together after a terrorist attack so resources are used wisely and the operations run efficiently, director Gordon Massingham said.

The scenario in the film involves the explosion of a freight train tanker car that sends toxic smoke into the air.

The video shows emergency organizations responding to the explosion; meetings to organize workers and government agencies; crews determining casualties and preparing for cleanup; and discussions on how to conduct evacuations and investigate the scene.

Nashville was chosen because of its completion last year of a disaster drill designed to determine how prepared the city was for a chemical or biological terrorist attack, Massingham said. That exercise involved the simulated release of a nerve gas at a sports stadium.

Richard Byrd, spokesman for the Nashville Office of Emergency Management, said he believes most of the nation now realizes how vulnerable all cities are to attack.

``We have to be ready for the unexpected,'' he said.

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Emergency Film Group: http://www.efilmgroup.com