stocks index

Wall Street was struck with another blow as last week Nasdaq OMX Group reported that it had found "suspicious files" on its U.S. computer servers which may mean they had been hacked. That was the latest damaging factor that even more deteriorated investors’ confidence that has been on a low level since last year’s “flash crash”.

The group said that there was no evidence hackers had accessed or acquired customer information or that its trading platforms were compromised.