The former president of the Tree of Life Synagogue said that working with the Department of Homeland Security on the building's exit routes helped to save an employee's life.

Multiple casualties were reported Saturday morning at the synagogue, located in Pittsburgh's Squirrel Hill neighborhood, and at least three officers were shot.

Michael Eisenberg told CBS 2 Pittsburgh security was a "major concern" when he was president, and that one of the synagogue's maintenance workers was able to escape because the building's exit doors were working effectively.

"He was able to get out of the building ... because these exit doors were working well," he said. "I just can't tell you how thankful I am just to do that one task that Homeland Security told us to do."

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President Trump tweeted about the incident, saying to beware of the active shooter.

Eisenberg said that on a typical day, like this weekend, the synagogue's doors would be open to anyone.

"Only on the high holidays is there a police presence at the entrance," he said.

He added that the building's exit doors were previously not easily opened from inside the building or outside.

"[The maintenance worker] could be alive because of this," he said.

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