The report found there were 252 major data breaches during a 15-month period.

Nearly half of the largest breaches were the result of theft — the largest affected more than 1 million people's medical records stolen from the back-up tapes of a vendor.

However most of the thefts involved unattended laptops.

This story is part of Federal News Radio's daily Cybersecurity Update. For more cybersecurity news, click here.