AP source: Hackers pierce system that runs Nasdaq

WASHINGTON — A federal government official tells The Associated Press that investigators are trying to identify computer hackers who have repeatedly broken into the network of the company that runs the Nasdaq Stock Market.

The official says that the hackers haven't compromised the exchange's trading platform and that investigators are looking into a range of possible motives for the cyberattacks — from financial gain to a national security threat.

The official spoke on condition of anonymity because the inquiry by the FBI and Secret Service is continuing.

The official says the penetrations occurred over the course of more than a year.

The Wall Street Journal first reported on the hacking.