According to the Certified Anti-Money Laundering Specialist (CAMS) Manual , 6th edition, if a bank's transaction surveillance system triggers an alert for a deposit of 250.000 USD into a client's account, the bank should take the following actions:
Request information and documentation from the client on the background of the transaction (CAMS Manual, 6th edition, page 46).
Contact the client advisor to learn if he has any insight on the transaction background (CAMS Manual,
6th edition, page 47).
Review the transaction background in the bank's transaction platform (CAMS Manual, 6th edition, page
47).
Discarding the alert as a false positive hit and reviewing the alert if the deposit is made in cash should not be done.
The bank should request additional information and documentation from the client to better understand the nature of the transaction. Additionally, the bank should reach out to the client advisor to learn if they have any insight on the transaction background. Finally, the bank should review the transaction background in the bank's transaction platform to determine if any additional alerts or anomalies are present. (CAMS Manual, 6th Edition, Pages 117-118)

During an internal investigation, employees should be instructed to do the following actions:
* Inform counsel of all request for documentation: This is to ensure that the legal rights and obligations of the organization and the employees are protected and respected. Counsel can also advise on the scope, relevance, and confidentiality of the requested documents1.
* Make copies of all documents provided to law enforcement: This is to maintain a record of the information that has been disclosed and to prevent any loss or alteration of the original documents. Copies should be made before the documents are handed over to law enforcement2.
* Keep a log of the documents requested: This is to track the progress and status of the investigation and to avoid any duplication or omission of the requested documents. The log should include the date, time, description, and location of the documents, as well as the name and contact details of the person who requested and received them3.
Providing corporate documents directly to law enforcement, on the other hand, is not an action that employees should be instructed to do during an internal investigation. This is because law enforcement may not have the legal authority or the proper warrant to access the documents, and doing so may violate the privacy or confidentiality of the organization or the employees. Employees should consult with counsel before providing any documents to law enforcement4.
References:
1: Internal money laundering reporting | The Law Society5 2: How to Conduct Effective AML Investigations - Blog | Unit212 3: What Is The Importance Of An Internal Investigation?4 4: Anti-Money Laundering: 5 Steps to Conduct an Audit3

MLROs are responsible for implementing and enforcing an appropriate risk-based approach for their firm, ensuring compliance with the relevant laws and regulations, and reporting any suspicious activities to the authorities. If they fail to discharge their duties, they may face personal liability and civil or criminal sanctions. MLROs are not the only individuals that can be held responsible for AML program deficiencies, as other senior managers, directors, or partners may also be liable depending on their role and involvement.
However, MLROs are often the primary focus of enforcement actions due to their specific responsibilities and obligations. MLROs cannot avoid liability by agreeing to a civil penalty, as this does not absolve them from their legal duties or potential criminal prosecution. Banks can also be found liable for AML program deficiencies and face fines, penalties, or other sanctions.
References:
Technical factsheet The role of the money laundering reporting officer
Consequences of not complying | AUSTRAC
Money Laundering Reporting Officer: The Role Of MLRO
FinCEN Penalizes U.S. Bank Official for Corporate Anti-Money Laundering Failures

account opening documents and account statements are examples of supporting documentation that can help the law enforcement agency to verify the identity, profile, and activity of the customer involved in the suspicious transaction. These documents can provide useful information such as the customer's name, address, date of birth, identification number, occupation, source of funds, transaction history, and beneficiaries. These documents can also help to establish the baseline of normal and expected activity for the customer, and to identify any deviations or anomalies that may indicate money laundering, fraud, or other criminal activities.
References:
* Suspicious Activity Report Supporting Documentation, section "What Constitutes Supporting Documentation", paragraph 2: "Supporting documentation may include, for example, transaction records, new account information, tape recordings, e-mail messages, and correspondence."
* Documentation Requirements: Suspicious Activity Report Supporting Documentation, section "SARs Documentation Requirements", paragraph 2: "Keep all documents with evidence of the background, the purpose of the transactions, the trigger, the investigation carried out, and all findings and conclusions."
* BSA/AML Manual, section "Assessing the BSA/AML Compliance Program - BSA Compliance Officer", paragraph 3: "The BSA compliance officer is responsible for ensuring that the bank's BSA/AML compliance program is implemented effectively, including timely updates in response to changes in regulations or business activities, and for managing all aspects of the BSA/AML compliance program. The BSA compliance officer is also responsible for ensuring that the bank's BSA/AML compliance program is communicated to all personnel and that adequate training is provided to appropriate personnel."

Conducting anonymous transactions is the most likely activity to facilitate money laundering through online banking systems with inadequate controls. Anonymous transactions allow money launderers to hide their identity, source and destination of funds, and the purpose of their transactions from the authorities and the financial institutions. Online banking systems that do not have proper KYC, customer due diligence, and transaction monitoring controls are vulnerable to being exploited by money launderers who can use various techniques, such as encryption, proxy servers, virtual currencies, prepaid cards, and online gambling, to conduct anonymous transactions123.
References:
* ACAMS CAMS Certification Study Guide, 6th Edition, Chapter 2, page 40-41, 43-44
* ACAMS CAMS Certification Video Training Course, Module 2, Lesson 2.4, Money Laundering Using New Payment Methods
* 1, Fighting money laundering in the age of online banking, virtual currencies and internet gambling | ERA Forum
* 2, Financial crime risk management in digital payments | McKinsey
* 3, The Relationship Between Digital Banking and Financial Crime