Missing Jayden Parkinson's mother has said her "heart is so heavy" for her daughter, who is believed to have been murdered.
In a post on Facebook, Samantha Shrewsbury called Jayden her "baby" and her "princess".
She wrote: "My heart is so heavy baby girl I just want to see you walk through my door with a "Tad Dar" I need you little lady my heart feels so empty without you u know ur My Tinymigriney xxxxxxx."
Jayden's mum's Facebook post
Police looking for the 17-year-old from Oxford have asked the public not to carry out their own searches.
Jayden has been missing for nearly two weeks and is thought to have been killed.
She was last seen leaving Didcot Parkway train station at 4.27pm on December 3 - and did not return home that evening as planned.
The teenager was last seen on December 3
Commander Supt Christian Bunt from Thames Valley Police said it was a "critical time" in their investigation and they are searching a number of sites in Didcot, Oxfordshire, and the surrounding areas.
He added: "We appreciate the public's co-operation and understanding while this takes place.
"Due to the nature of the police searches taking place, we would request the public refrain from organising their own search activity at this stage to avoid the risk of jeopardising the investigation."
A Sky News graphic of the man and suitcase based on police descriptions
Police believe a young man seen struggling with a large suitcase in the area could hold the key to the inquiry.
Officers are trying to find him after he was spotted with the bag in a field in the village of Upton, about three miles south of Didcot, early on December 9.
Detective Chief Superintendent Andy Murray said: "That suitcase was large, it was heavy, it was difficult to manage and that man was having difficulty removing that suitcase from that area."
Two men have been arrested on suspicion of murder
Mr Murray said the same man with the suitcase was seen in nearby Didcot about half an hour later.
The man has been described as about 20, white, about 5ft 6in, of medium to slim build, with short dark hair.
The suitcase was about 3ft by 2ft, about 15in deep and light coloured, probably made of canvas material, and had an extendable handle and wheels.
Sky News Correspondent Lisa Dowd, who is in Oxfordshire, said: "The focus of the police search continues to be a patch of farmland next to the village of Upton just a few miles from where Jayden was last seen leaving Didcot railway station.
Upton is about three miles south of Didcot
"Search specialists and forensics officers have created a base next to Saint Mary's church in the village and have been walking along a footpath to a tree-lined copse, which locals say also contains some derelict farm buildings."
Dowd added: "The police helicopter has been hovering above this area, which is next to a disused railway line."
Mr Murray said police were also searching addresses that Jayden "may be associated with". Detectives also uncovered a recycling bin in Didcot to try to find evidence, he said.
He added that officers were certain the man spotted in Upton with the suitcase was the same man seen shortly after in Didcot, but could not say why.
Jayden is white, of slim build with shoulder-length dark brown hair and brown eyes. She was wearing light blue faded jeans, a brown hooded top with red lettering on it, a black waist-length jacket, and dark trainers when she was last seen.
It is believed that on December 3 she walked up Oxford high street through the town centre, arriving at the city's train station at 4.07pm, where she boarded a train to Didcot. She went missing after leaving that station.
Two men aged 17 and 22 remain in police custody on suspicion of murder in connection with her disappearance.
:: Anyone with information has been urged to contact Thames Valley Police on 101 and quote URN 542 10/12, or Crimestoppers anonymously on 0800 555 111.
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