Police have said there is 'no known link' between a 24-year-old murder suspect and Bobbi-Anne McLeod as they continued to search a house four miles from where she vanished.
Devon and Cornwall Police said they had not established a connection between the man and the 18-year-old girl but were keeping him in custody for another day for questioning.
Meanwhile another man, 26, has been released with no further action after also being arrested on suspicion of murder.
It comes as police forensic investigators are searching a home in Plymouth four miles from where Bobbi-Anne vanished.
Officers cordoned off a property in Southway today with residents reporting their arrival from 8am. Photos taken in the area show police tape draped across hedges leading to one of the properties.
Devon and Cornwall Police refused to confirm or deny if the activity is connected to the ongoing investigation into the disappearance and murder of Bobbi-Anne.
The youngster went missing in Plymouth on Saturday after failing to get on her bus to the city centre to meet her boyfriend. She was found dead on Tuesday close to the coastal path and car park above Bovisand beach.
Yesterday, it was claimed police are probing the theory that Bobbi-Anne was kidnapped by a group of men with a 'sexual motive'.
Her family think she was snatched from a bus stop near her home at 6pm on Saturday after she failed to meet her boyfriend Louie Leach, who reportedly waited all night for her to arrive. He is being comforted by her family.
Officers cordoned off a property in Southway today with residents reporting their arrival from 8am. Photos taken in the area show police tape draped across hedges leading to one of the properties
Devon and Cornwall Police refused to confirm or deny if the activity is connected to the ongoing investigation into the disappearance of Bobbi-Anne McLeod
Louie Leach, 17, the grieving boyfriend of Bobbi-Anne McLeod is being comforted by her family as police continue to question two murder suspects
Bobbi-Anne's boyfriend Louie Leach, 17, (pictured together) who had been in a relationship with Bobbi-Anne for more than six months, was reportedly among the group of friends waiting for her in Plymouth city centre for a night out she never arrived on.
Assistant Chief Constable Nikki Leaper said this afternoon: 'A significant number of enquiries and searches have been carried out overnight and into today in relation to the ongoing murder investigation in Plymouth.
'These enquiries remain on going across a number of scenes in and around the city. Earlier today, a 26-year-old man who was arrested on suspicion of murder, was released from police custody having been eliminated from the enquiry.
'A 24-year-old man remains in police custody at this time on suspicion of murder under a warrant of further detention.
'This warrant enables police to extend the time in which a person can be detained within police custody whilst an investigation is ongoing.'
ACC Leaper added: 'I can confirm that at this time, there is no known link between the suspect and victim and I would like to reassure the public that at this time, we are not seeking anyone else in relation to this matter.
'This remains a developing and active case and as such we would remind everyone not to speculate in relation to this matter. It is crucial that we uphold the integrity of this investigation at all times.
'Once again, I give my utmost thanks to the public and communities in Plymouth who continue to be supportive of our enquiries.'
Officers are searching the area where she vanished as well as woodland and cliffs above a Devon beach where Bobbi-Anne's body was found eight miles away yesterday.
Detectives are trying to work out if the teenager was abducted or willingly entered a car - and how many people were involved.
But a source close to the investigation was quoted by the Guardian as saying 'it was most likely a stranger abduction' with a 'sexual motive being a significant line of inquiry'.
A relative of Mr Leach suggested multiple people were involved, telling MailOnline: 'From what we know so far, she was abducted by at least two men and police have not ruled out the possibility that more were involved. And it doesn't appear that she knew them.
'She was at the bus stop on her way to meet Louie and then she disappeared. We haven't been given the full details on who these men are and what actually took place.
'The police don't want this information getting out because it may impact the inquiry. The family are continuing to be updated by officers and there's a lot of difficult things for them to take in.'
As tributes for Bobbi-Anne continued to flood in, Smeaton's Tower in Plymouth was lit up purple in her memory yesterday.
Mr Leach has been staying with Bobbi-Anne's mother and two siblings at their home in Plymouth since detectives revealed on Tuesday that a body had been discovered.
She was reported missing on Saturday evening and was found dead yesterday close to the coastal path and car park above Bovisand beach.
Police have sealed off a stretch of coastline overlooking Plymouth's Sound and are gathering evidence.
Friends told MailOnline that Bobbi-Anne, 18, had been due to meet a group including her boyfriend of six months. Louie raised the alarm when she did not show up at around 8pm. The Sun claims he waited at the bus stop all night when she vanished.
One friend said: 'Louie is with Bobbi-Anne's family now and they are helping each other through this difficult time. They can barely speak. There are no words for the horror they are living through. Bobbi-Anne and Louie were really in love and were a wonderful couple. They had their whole lives ahead of them and now this has been cruelly taken away from Louie and it's crushed him.' It came as her family thanked the public for their 'love and support'.
Detectives are trying to work out if the teenager was abducted or willingly entered a car - and how many people were involved
Bobbi-Anne was reported missing on Saturday evening and was found dead yesterday close to the coastal path and car park above Bovisand beach
The 18-year-old's family believe she was snatched from a bus stop near her Plymouth home at 6pm on Saturday after she failed to meet her boyfriend, Louie Leach, who reportedly waited all night for her to arrive
Ms Mcleod's headphones and tobacco were found at the Bampton Road bus stop where she was last seen, one of her friends said
A friend of Ms McLeod, who went to both Leigham Primary School and Tor Bridge High secondary school with her, said she believed 'Bobbi didn't have a clue' who her attackers were
As tributes for Bobbi-Anne continued to flood in tonight, Smeaton's Tower in Plymouth was lit up purple in her memory
Her older brother Lee McLeod paid tribute to his 'beautiful sister' and visited flowers left in her memory
Police has closed the road leading to the Bovisand beach in Devon, where Bobbi-Anne was found dead
Forensics officers are