Source: VA Inspector General searching employees' computers

(CNN) – Criminal investigators from the the Office of Inspector General are on the ground in Phoenix, CNN has learned, and a source within Veterans Affairs says employees computers are being taken for examination.

On April 23, CNN revealed accusations from a retired Veterans Administration doctor that the VA in Phoenix had a secret list for patients waiting for doctor appointments that differed from the official list. He said then that 40 veterans died waiting for care.

Right now, the investigation's main focus is on Phoenix, but investigators are also looking into similar allegations of delayed care in San Antonio, Texas, Fort Collins, Colorado, as well as other locations.