Parole officers in California repeatedly failed in their supervision of the man who allegedly held a girl captive for 18 years, a report says.

Phillip Garrido is accused of snatching Jaycee Dugard in 1991, when she was 11, and fathering two children with her.

The report into the case says Garrido, who was on parole for rape, was wrongly classified as low-risk and inadequately supervised.

As a result, it says, many chances of discovering Ms Dugard were missed.

Ms Dugard was found in ramshackle huts hidden behind the house where Garrido lived with his wife, Nancy.

The pair have pleaded not guilty to charges of kidnapping and rape.

The girl had been snatched outside her home in the California town of South Lake Tahoe in 1991, and found in August at Garrido’s home near Antioch.

He had been released from prison in 1988 after serving 11 years of a 50-year sentence for rape.

Dugard was kept hidden at the Garridos’ home

The report lists numerous lapses by the California Department of Corrections and Rehabilitation, including:

• Failure to investigate an unknown 12-year-old girl during a home visit
• Failure to refer Garrido for a mental health assessment
• Lack of discussion with neighbours and local agencies
• Failure to investigate information showing Garrido had violated the terms of his parole

The report spoke of “systemic problems” in the parole system, and called for better use of GPS monitoring for parolees.