The Chinese Embassy in Spain is expressing concerns over a reported police raid of a major Chinese bank's offices in Madrid.

It's being reported Spanish authorities have raided the Madrid offices of the Industrial and Commercial Bank of China on Wednesday as part of a joint operation connected to alleged money laundering and tax fraud.

It's said to be connected with a major police operation known as Operation Snake, which has led to over 30 arrests in Barcelona, Madrid and Valencia since this past May.

The Chinese embassy says it has not received any information about the operation "from any official department in Spain."

An embassy statement says given the information it does have, it says it believes the ICBC offices in Spain don't appear to have acted in violation of local laws.