Senator calls for SEC hack probe

A key lawmaker called on US securities regulators to work with criminal authorities to crack down on hackers following reports that cyber attackers have repeatedly tried to break into trading systems run by Nasdaq OMX Group. Senator Bob Menendez, a Democrat from New Jersey and a member of the Senate Banking Committee, sent a letter to the Securities and Exchange Commission urging the agency to take a closer look into hacking incidents and what can be done to prevent them.