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New York City Mayor Bill de Blasio said he was unaware about the arrest of his only daughter, Chiara de Blasio, until a reporter notified him.

Chiara de Blasio, 25, was among hundreds of protesters arrested over the weekend for "unlawful assembly" and blocking traffic at the intersection of East 12th Street and Broadway.

She was in the roadway with about 100 demonstrators, yelling and screaming and throwing objects in the direction of the police, according to the police report.

Chiara's name was released by a police union known for its hostility toward the mayor.

The union, the Sergeants Benevolent Association, posted Chiara's booking information on Twitter Saturday night. Twitter quickly snatched the booking information down and locked the police union's account.

Within minutes, Chiara's booking info was reposted on other forums and social media accounts.

Mayor de Blasio was understandably upset that his daughter's name was the only arrestee leaked by the police union.

According to the NY Times, the police department doesn't normally release internal police reports.

The booking information, which Sandrarose.com viewed, contained personal information, including her height, weight, and "curly/wavy" hairstyle. Her physical condition was described as "apparently normal."

The police union's account was still locked on Monday morning for "violating our private information policy," a Twitter spokesman confirmed to The Times.

Chiara opened up about her battle with depression and drug addiction in 2014. She received an award for speaking out about her mental illness from then-Human Services Secretary Kathleen Sebelius.

Mayor de Blasio and his wife Chirlane McCray also have a son, Dante, 22.