Sept 13 (Reuters) - Nearly 40 states have joined a probe of Equifax's handling of a massive data breach that exposed valuable information on up to 143 million Americans, according to the Illinois attorney general's office, which is leading the probe.
Eileen Boyce, a spokeswoman for Illinois Attorney General Lisa Madigan, declined to identify the other states.
Connecticut and Pennsylvania are part of the probe, the Connecticut state attorney general has said previously. Iowa is also part of the probe, according to state spokesman Geoff Greenwood.
Equifax's shares have fallen more than 30 percent amid revelations of investigations into the data breach and the company's decision to delay disclosing it. (Reporting by Karen Freifeld and Diane Bartz; Editing by Sandra Maler)