The New York Police Department detained a man Thursday who was pacing outside the U.N. headquarters in Midtown Manhattan with a shotgun.

The incident put the U.N. operations in the building on lockdown while police confronted the man. The NYPD said he was detained peacefully.

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"Based on statements he made, we knew early on this was not terror-related," said Harry Weeden, chief of the NYPD Special Operations Division.

The man, who wore a red jacket, held a shotgun under his chin as he paced outside the building. The NYPD said he surrendered the gun after officers agreed to deliver papers he had to the U.N.

In a press conference, the NYPD said the man had medical papers and some other documents in a bag. The department did not elaborate on what was in those documents but added that his motive was not completely clear based on the documents. The NYPD is still investigating the documents.

The man's gun was loaded with one round. The officers said he did not threaten to commit suicide but refused to put down the gun until the documents were given to the U.N.

The NYPD is not identifying the individual at this time but noted that officers believe he is from Florida and does not have a criminal record.

The NYPD also said it does not have an announcement yet on any charges against the individual and emphasized that the investigation is ongoing. The bomb squad swept the man's hotel room and truck and have found no active threats. Authorities believe he walked from his hotel to the U.N. building.

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After detaining him, the NYPD sent him to a nearby hospital for an evaluation. A spokesperson for the U.N. said the headquarters has resumed operations. No one was reported dead or injured in the incident.