According to sources from news outlet money.pl, a Polish cryptocurrency exchange known as Coinroom has shut down abruptly and disappeared with all its customers’ funds in tow.

The Polish exchange, first registered in 2016, has even deleted its Twitter page.

Coinroom Shuts Down

The news outlet reportedly received an email from one of the exchange’s customers who said that the exchange ceased operations overnight and disappeared with all the funds in April. Though the exact amount stolen isn’t yet known, many customers reported having over $15,000 worth of cryptocurrency in their account.

Before culling the exchange, Coinroom had reportedly sent emails to its customers regarding contract terminations. It gave them only one day to withdraw their money, which was in accordance with regulations the exchange signed with users.

However, reportedly, the exchange returned only part of the funds to some customers, while many others didn’t receive any of their funds back at all.

One customer reportedly lost 2.005 Bitcoin (available on Coinbase)s, which values over $16,000 USD at current prices.

Another user said the following:

“[O]n the second day after sending the e-mail, I went to the Coinroom headquarters. The lady at the reception did not want to let me in, she claimed that nobody was in the office. Instead, she called someone from the company. I was asked to leave my details. Nobody contacted me.”

The issue is now being investiGated by the District Prosecutor’s Office in Warsaw. According to sources here, the office has begun “proceedings against Coinroom in connection with unauthorized activities providing payment services that intermediates in the exchange of cryptocurrencies.”