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A British retailer with thousands of stores around the world said Sunday that it has suspended work with a Chinese factory as it investigates allegations of forced labour behind its Christmas cards – spurred by a plea for help that a 6-year-old girl reportedly found scrawled in her family’s purchase.

Supermarket chain Tesco said it has also stopped selling the cards after the Sunday Times described an all-caps note, attributed to Chinese prisoners, that urges its reader to contact a human rights group. The report follows years of other notes allegedly penned by abused workers that have raised concerns among unsuspecting shoppers and prompted inquiries.

Tesco said in a statement that it was stunned by the accusations of forced labor and would cut ties with the cards’ supplier if it was found to have violated Tesco’s rules against prison labor. The company said it has a “comprehensive auditing system,” adding that the cards’ supplier “was independently audited as recently as last month” and that no evidence of wrongdoing surfaced.

The supplier, Zheijiang Yunguang Printing, did not immediately respond to The Washington Post on Sunday, nor did the Chinese Embassy.

The upheaval started with a holiday purchase that supports Tesco’s charity, a London family said in an interview posted by the BBC. Florence Widdicombe was looking through the cards her mother picked up – she wanted to write to her friends at school – when she starting laughing, her father said.