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The Serious Fraud Office (SFO) has charged Barclays Bank PLC with "unlawful financial assistance" related to billions of pounds raised from Qatar in 2008.

The same charges were bought against Barclays PLC in June last year.

The move to charge Barclays Bank as well is significant because it holds the banking licence that allows it to operate in different countries.

So, if Barclays was found guilty, it could lose that crucial licence.

In 2008, to avoid a government bailout, Barclays took a £12bn loan from Qatar Holdings, which is owned by the state of Qatar.

Under that deal Barclays loaned £2.3bn back to Qatar Holdings.

that loan was used either directly, or indirectly, to buy shares in Barclays, which the SFO says is "unlawful financial assistance".

"Barclays PLC and Barclays Bank PLC intend to defend the respective charges brought against them.

"Barclays does not expect there to be an impact on its ability to serve its customers and clients as a consequence of the charge having been brought."

Other than the charge, the SFO has released very little information about its investigation.

But a top lawyer said the case is likely to revolve around whether the directors knew what the loan was being used for.

"The SFO may have to establish the precise intention of the directors when making the loan which is the subject of the investigation and it might be difficult to prove to a criminal standard that they had an unlawful intention," said Philip Marshall QC at Serle Court Chambers.

How significant is the charge against Barclays Bank?

Analysis: Simon Jack, ����ý Business Editor

It was always odd the SFO charged the parent company Barclays PLC and not Barclays Bank as it was the bank that lent $3 billion to Qatar which it's alleged was used to buy shares in Barclays.

At the time it was interpreted by some as sparing a strategically important bank for the UK from the harm of potentially losing the ability to operate in important markets (like the US) - a possible consequence if convicted.

So today's decision to charge the bank itself is significant.

The fact the shares are unmoved suggest markets agree with Barclays insiders who say the following: Being charged in itself isn't a problem, this incident was ten years and four management teams ago, it was done in order to save the bank (and the taxpayer billions). Even if convicted there are banks (UBS, BNP, Credit Suisse) who have been convicted and continued operating.

The emergency funds from Qatar allowed Barclays to avoid a government bailout in 2008 at a time when rivals Lloyds Banking Group and Royal Bank of Scotland were forced to rely on a taxpayer rescue.

Following a five-year investigation into the deal with Qatar Holdings, the SFO in June charged Barclays PLC and several former executives with conspiracy to commit fraud.

Former chief executive John Varley, former senior investment banker Roger Jenkins, Thomas Kalaris, a former chief executive of Barclays' wealth division, and Richard Boath, the ex-European head of financial institutions, were all charged in relation to that investigation.

The bank and its former bosses will face trial in 2019.

Barclays is the first British bank to face a criminal trial related to its conduct during the financial crisis.