Detectives searching for 25-year-old Samantha Henderson are appealing for drivers who use the A351 to help find her.

Samantha, of Halves Cottages, was reported missing at 8.43am on Thursday 22 January 2015.

The last confirmed reported sighting of the mother-of-four was at around 3pm on Wednesday 21 January 2015 outside Corfe Castle Primary School in East Street.

A27-year-old man was arrested on suspicion of her murder on Friday, but her whereabouts are unknown.

Today senior investigating officer Neil Devoto, of Dorset Police’s Major Crime Investigation Team, appealed for help tracing the movements of Samantha’s car between 3pm on Wednesday and 5pm on Friday. It is a blue Peugeot 307 Estate with the registration HV04 ZFM.

DI Devoto said:"I am very keen to hear from anyone who may have travelled along the A351 and in the Corfe Castle area between 3pm on Wednesday 21 January 2015 and 5pm on Friday 23 January 2015 and captured their journey on CCTV or cameras in their cabs, cars or on their motorbike or bicycle helmets.

"This footage may be very useful to my investigation and I urge you to call me.”

Extensive investigations are ongoing, including forensic experts examining Samantha’s home address in Corfe Castle. Searches are also being carried out in the Corfe Castle village area.

DI Devoto continued: “Our search for Samantha is continuing and we are desperate for any information about her whereabouts.

“Samantha’s disappearance is completely out of character as she has never gone missing before leaving her four young children who are aged one, two, four and six.

“We urgently want to hear from anyone who has seen Samantha after 3pm on Wednesday 21 January 2015, had contact with her whether by phone or social media or has any information of her whereabouts.

“We are keeping an open mind about what may have happened to Samantha but are fearing the worst. We need the public’s help and anyone with information, no matter how seemingly insignificant, should call Dorset Police as soon as possible.”

Samantha is described as white, five feet three inches tall, of a very slim build and with long blonde hair.

Detectives this morning, Monday 26 January 2015, were granted a further extension until 5pm on Tuesday evening to question the 27-year-old man who is currently assisting police with their enquiries.