Alicia was meant to have caught a bus from Cornwood to Plymouth

Anthony and Joan Eborne issued their plea to 18-year-old Alicia through Devon and Cornwall police on Thursday.

More than 60 officers have been searching part of Dartmoor for the missing college student, who vanished after leaving home to catch a bus last Friday.

Police say they cannot rule out the possibility she has been abducted.

Alicia was last seen by her mother leaving her home in the hamlet of Corntown, near Ivybridge, to catch a bus into Plymouth.

Mr and Mrs Eborne said: "We are surprised Alicia has stayed away from home. We know of no reason for her to leave us.

There are serious concerns for this girl's safety and wellbeing Sergeant Mike Rose

"Alicia please contact us just to let us know you are safe and well.

"We love and miss you and want to know you're safe.

"None of us are angry with you, we just miss you and are very worried.

"Please, please just contact us so we know you're safe, we love you."

Very large search

The couple issued their statement as officers were searching the Roborough and Bickleigh areas of the moor for any sign of the teenager.

The seven-mile route from Corntown into Plymouth is to be searched over the next few days.

Alicia would have had to walk half a mile to catch the 58 or 59 bus from the nearby village of Cornwood.

Sergeant Mike Rose, force search adviser, said: "It is a very large search and it is going to continue to be a very large search.

"There are serious concerns for this girl's safety and wellbeing and this is part of the overall search strategy."

Alicia had to walk half-a-mile from her home to a bus stop

Alicia, who studies health and education at Plymouth College of Further Education, lived at home with her parents and three brothers.

She was said to get on well with her mother and father, who are both Jehovah's Witnesses.

She did not turn up at her job in a Plymouth patisserie on Friday afternoon and did not collected her pay packet from work and has not touched her savings.

Her friends contacted the police that same evening when she failed to show up for a pre-planned night out in the city.

Police said the student was said to use her mobile phone frequently to text and call friends, but her phone has not been used since her disappearance.

She is described as having a fair complexion, slim build and is approximately 5 ft 4 in (1.60 metres) tall, with straight, shoulder-length mousey brown hair.