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PHILADELPHIA (CBS) – Vandals shattered windows at the Starbucks in Rittenhouse Square Monday morning.

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The store located at 18th and Spruce Streets was the center of controversy earlier this year.

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The vandals left notes inside the coffee shop that referenced the ongoing prison labor strike happening across the country.

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Starbucks says they do not hire, or work with agencies that employ prison labor.

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Crews repaired the windows and the store reopened Monday afternoon.