http://www.businessinsider.com/hsbc-ties-to-al-rajhi-bank-2012-7
One of the most damning parts of the report details HSBC's relationship with Saudi based Al Rajhi Bank, a member of Osama bin Ladin's 'Golden Chain' of important Al Qaeda financiers. The relationship has spanned decades, perhaps that is why even when HSBC's own internal compliance offices asked that it be terminated in 2005, even when the US government discovered hard evidence of Al Rajhi's relationship with terrorism, HSBC continued to business with the bank until 2010.
Al Rajhi bank is owned by the billionaire Al Rajhi family and holds $59 billion in assets. It is Saudi Arabia's largest private bank.
From the report (page 194):
It doesn't stop there: Al Rahji is also known for financial services to 9/11 hijacker Abdulaziz al Omari, who was on American Airlines flight 11 (page 201).
Read more: http://www.businessinsider.com/hsbc-ties-to-al-rajhi-bank-2012-7#ixzz22cVBvbvr
There are other connections going on with the bank and money laundering for drug cartels also.