DOWNEY -- A laptop computer containing over 660 patient names and diagnostic information was stolen last month from a rehab center in Downey, health officials said Friday.

The laptop was reported stolen from Rancho Los Amigos National Rehabilitation Center on Feb. 24 and contains at least 667 patient names, date of birth and diagnostic information.

County Department of Health Services spokesman Michael Wilson said the laptop was not encrypted and letters have been sent to patients alerting them of the theft.

Health officials say the laptop was attached, at the time, to a complex machine that helps diagnose neuromuscular disorders such as multiple sclerosis.

The hospital has begun a review of its portable devices in hopes of avoiding future privacy breaches.

Anyone with questions on the breach is asked to call the county at (877) 726-2461