Nassau police determined "there was no threat" and reopened a Garden City office building that was evacuated to investigate a possible hostage situation Tuesday afternoon, police said.

The incident started when someone called Garden City police about 2:15 p.m. about a "possible threat to life" at the office building at 200 Garden City Plaza, adjacent to Roosevelt Field mall, said Nassau Police Deputy Insp. Gary Shapiro.

About 21/2 hours later -- after Nassau and Garden City police officers conducted a room-by-room search that included a police K-9 team -- Shapiro said the building was reopened.

"No threat has been discovered," said Shapiro. "The building is now open."

Asked if the call was a hoax, Shapiro would only say police are investigating.

Evan Cohen, a lawyer whose firm is on the fourth floor, said building management told workers to leave without explanation.

"We were just sitting working. . . . They came to our office and said we had to leave," said Cohen, 53, of Garden City, who stood in the mall parking lot across the street. "The cops said you gotta get across the street."

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Steven Denkberg, 56, an investment adviser at Gateway Investments, which is located on the second floor of the building, said a police officer came in his office with a gun drawn.

"He wanted to know if everything was OK in the office and said they received a call that there was a hostage situation involving a bomb and someone with a shotgun, and he asked us to leave, and everybody vacated the building."

Shapiro declined to confirm Denkberg's description.