An emotionally disturbed man was arrested Friday after he brandished a cane sword on the Empire State Building's 79th-floor observation deck, police said.

Authorities said they were called to the landmark tower around 3:40 p.m. after the 35-year-old man wielded the sword and put it to his chest.

NYPD Chief of Department Terence A. Monahan tweeted a video of the incident and the officers' response.

"Our men & women in blue are prepared for any situation. When an emotionally disturbed man walked into the Empire State Building holding a cane sword today, NYPD cops reacted quickly to keep people safe. Our highly-trained officers delivered a safe outcome for everyone," he said. "Well done!"

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The man was taken into custody and brought to Bellevue Hospital.

No one was injured and no charges have been filed yet, police said.

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The man was threatening to kill himself, sources told the New York Post.

“I see him sitting ... sort of like in a sleeping position," witness Paul Allen said. "Then when I was queuing up, he got up and put the sword to his chest and started shouting."