An off-duty Tarrytown police officer restrained a woman who was preparing to jump from the Tappan Zee Bridge Friday afternoon, according to State Police and Tarrytown Police.

The woman, who has not been identified by police, was standing midway across the bridge on the south side near the Westchester County-bound lanes when Sgt. John Gardner of the Tarrytown Police Department spotted her at 2:30 p.m., police said.

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Gardner, who was driving home toward Rockland County, saw the woman bent over the rails near the center of the bridge and initially thought she was sick to her stomach, Tarrytown Police Chief Scott Brown said.

When Gardner realized the woman was getting ready to jump, he physically restrained her. An off-duty NYPD officer who was also passing by stopped his car and helped Gardner keep the woman from jumping until troopers arrived, according to police.

The woman was not hurt and was sent by ambulance to Westchester County Medical Center in Valhalla where she was evaluated. The situation caused traffic delays in both directions on the Tappan Zee Bridge for about 30 minutes as drivers slowed to look, police said. Traffic returned to normal after police cleared the scene a few minutes before 3 p.m.