SocGen's controls 'lacked depth'

Mr Kerviel has said he never considered "running away"

An internal investigation into billions of euros of losses at Societe Generale has found that controls at the French bank "lacked depth".

The results of the investigation also show that rogue trades were first made back in 2005.

The bank set up an independent committee to investigate the 4.9bn euros ($7bn; £3.7bn) in losses.

The bank blames former employee Jerome Kerviel for the losses, saying he covered up unauthorised trades.

Bonus details

But the report said the bank's own systems were partly to blame.

It said staff had failed to make detailed checks and the bank lacked systems used by rivals that would have probably identified the rogue trades.

The SocGen report also gave details of Mr Kerviel's bonus.

It said in 2006 he received 60,000 euros and asked for 600,000 euros in 2007, but instead received half that.

The report also found no evidence that more than one trader was involved.

Kerviel detained

Mr Kerviel is in custody while the case is being investigated.

He is accused of breach of trust, falsifying documents and breaching computer security.

A court ruled that he should be detained because of the "necessities of the investigation" and the risk that he could flee the country.

Mr Kerviel has said that he never considered "running away" after the bank blamed him for the huge trading losses.

On Thursday Societe Generale reports results for 2007.

Last month it forecast an 82% slump in net profit to 947m euros.