Bank withheld transfer “money laundering”

Hello,

today my bank called me and said that they have withheld a transfer of me because of money laundering reasons. The amount was almost 1K Euros which I deposit yesterday in cash at my local bank. I wanted to send the money to Moonpay in England. The woman said they withheld the transfer because I can‘t deposit cash and then send it abroad.

Is this a normal? Did this happen to someone in here before and how can I send the money to Moonpay now?

Thank you in advance.