The incident happened in the hallway of an apartment building on Main Street in Yonkers around 12:30 p.m. Monday.
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"At that point, officers responded, there were shots, we are still trying to narrow down who fired," Yonkers Police Commissioner John Mueller said.
The 24-year-old suspect was struck in the leg and while no one else was shot, an officer did suffer a concussion and broken vertebrae in his neck.
The 20-year veteran of the department, who is in his 50s, was injured after leaping over a railing in the stairwell and falling roughly 10 feet before landing on the floor below.
He is in intensive care and there are concerns he could be paralyzed.
Other officers were being evaluated but were not said to be injured.
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The suspect's condition was not yet known, but he is expected to survive.
"This is very preliminary but we believe the suspect called himself about a man waving a gun around," Mueller said. "So that is interesting, we'll have to piece it all together."
Officers are trying to confirm if he made the call.
Police are saying they are not looking for anyone else and it's not clear if there was a victim initially or if the suspect had been menacing anyone.
Authorities have not yet recovered a gun and were waiting for a search warrant.
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The suspect does not have a criminal record.
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