The 14-year-old was last seen alive in November 1991 at her family home at Fitzgerald.

Police have searched a property at Uxbridge Road, Bushy Park, as well as a property, workshop and house at Gordon River Road, Karanja.

Detective Inspector Colin Riley said police were determined to find evidence to prosecute the principle offender or offenders for Eve's death and prosecute those who have concealed evidence relating to her death.

Eve was born in New South Wales and moved to Tasmania with her family in January 1989 and attended Glenora District High School.

It is believed she had a fight with her parents Helen and Jim Askew and left a note indicating her intention to leave home after being grounded because of smoking. Mr and Mrs Askew died in a car crash at Granton in 1996.

At the time of her disappearance she was described as being 157 centimetres tall, of a slim build with red hair and a fair complexion with freckles. She was wearing a distinctive tracksuit.

Her family described her as a shy and reserved person who did not interact with people easily and avoided meeting new people if she could.

Investigators conducted extensive searches near the family home and interviewed friends and associates but no further evidence was found.

The case was reopened in 2011, after a 2001 investigation failed to turn up any useful information.

Anyone who has information about the circumstances surrounding Eve's disappearance is asked to contact investigators on 0418 589 544.

There is a reward of up to $100,000 for information that results in a conviction of an offender in relation to Eve's disappearance.

More to come.