Websites of exchanges Nasdaq, BATS hit in online attack

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Websites of exchange operators Nasdaq and BATS have been attacked by hackers over the last 24 hours, causing ongoing disruptions for those trying to use the sites, spokespersons for the companies said on Tuesday.

Only the banner carrying the logo at the top of the web page for www.nasdaq.com was visible during repeated attempts to access Nasdaq's site on Tuesday afternoon. Trading in Nasdaq-listed stocks has not been affected, however.

A Nasdaq OMX Group spokesman confirmed that it had been suffering a denial-of-service attack (DOS) since late on Monday but said they had not located the origin of the attack and were unable to say when it would be resolved. Another site, www.nasdaqtrader.com, was also affected. "The website wasn't hacked, nobody got any information. What they did was try to block access for our users," said Nasdaq spokesman Joseph Christinat.