A person has been arrested after the city of Boston’s Holocaust memorial was vandalized on Monday night.

WHDH reports that Boston police arrested a suspect after witnesses claimed to see a person throw a rock at the memorial, which shattered a pane of glass.

#BREAKING: BPD confirms person now in custody for vandalizing Boston's Holocaust Memorial downtown. Witness says a rock was thrown. #7News pic.twitter.com/fsnhP34Wl1 — Justin Dougherty (@DoughertyJC) August 14, 2017

WHDH reports it’s the second time the memorial has been vandalized in 2017. A man was arrested in June for smashing another pane of glass on the memorial.

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Boston Mayor Marty Walsh (D) responded to the vandalism Monday night, praising the Boston police for a “quick arrest” and vowing that the city of Boston would “stand up against hate.”

Today & every day Boston stands up against hate. I'm saddened to see such a despicable action in this great city. (1/2) — Mayor Marty Walsh (@marty_walsh) August 15, 2017

Thankful to public and @bostonpolice for quick arrest of the person responsible for vandalizing Holocaust Memorial. (2/2) — Mayor Marty Walsh (@marty_walsh) August 15, 2017

The memorial was erected in 1995 and contains six glass towers, representing the 6 million Jews who were killed and the six years of the Holocaust.

The vandalism follows violent clashes at a white supremacist rally in Charlottesville, Va., this weekend. One person was killed and at least 19 people were injured when a man with alleged ties to racist groups plowed his car into a group of peaceful counterprotesters.