The arrest in the Claudia Lawrence investigation comes a week after police released new CCTV footage of two people walking near the missing chef's home on the night of her disappearance.
The footage, filmed at 7.15pm on Wednesday 18 March 2009, showed an area near an alleyway at the rear of Miss Lawrence's terraced house in York.
North Yorkshire Police did not confirm whether a man in his 50s, arrested this morning on suspicion of murder, was one of the two people in the CCTV footage.
A force spokesman said investigations are ongoing following today's arrest.
North Yorkshire Police are urging anyone with information on the individuals featured in the CCTV to get in contact with them by calling them on 101, selecting option one, and passing the details on to the Force Control Room, or by calling Crimestoppers anonymously on 0800 555 111, or online.
Watch the CCTV here:
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The father of Claudia Lawrence has said it is encouraging that police are continuing to seek answers as to what happened to his daughter.
Peter Lawrence said: “It is encouraging to know that following all the media activity over the last three weeks from Claudia’s 41st birthday to the 6th anniversary of her being missing, North Yorkshire Police continue to be active in seeking answers as to what has happened to Claudia.
"It is to be hoped that the matter can be resolved as soon as possible and I encourage people to continue to come forward with information to the police by phoning them on 101.”
It comes after North Yorkshire Police arrested a man in his 50s in York this morning on suspicion of her murder.
Miss Lawrence was 35 when she disappeared six years ago in York on March 18, 2009. Her body has not been found.
North Yorkshire Police detectives are asking the media and members of the public not to name a man who has been arrested on suspicion of the murder of Claudia Lawrence.
A man in his 50s, from the York area, has been arrested this morning. Police stressed that Claudia's body has not been found.
“To ensure the investigation and legal process are not compromised or potentially damaged in any way during this critical phase in seeking the truth about Claudia’s disappearance, North Yorkshire Police strongly advises the media and members of the public against identifying the man who has been arrested.
“This includes naming or publishing images of the man on traditional media platforms or social networking sites.
“I urge everyone to show restraint and patience while we carry out these very important enquiries.”
Police investigating the disappearance of Claudia Lawrence have arrested a man on suspicion of murder.
A man in his 50s, from York, was arrested this morning, North Yorkshire Police said.
Miss Lawrence was 35 when she disappeared six years ago in York on March 18, 2009.
Police said the York University chef's body has not been found.
A police spokesman said searches are being carried out in relation to the investigation, and are expected to carry on for a number of days.
Miss Lawrence's family have been informed of the development, police added.
A detective searching for missing Claudia Lawrence said he is "actively pursuing new leads" on the sixth anniversary of her disappearance.Read the full story ›
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Workmen in York discovered what was believed to be an unexploded "World War" mortar bomb this afternoon.
The park and ride site where the discovery was made at 3.55pm was evacuated as bomb disposal experts attended the scene.
Good news confirmed by Bomb Disposal that the mortar shell is safe. Everything will revert to normal asap. Many thanks for your patience.
Professor David Fleming, Vice Chancellor of York St John University, said: “It is with great sadness that the University has learned of the death of Megan Roberts, a second year Fine Arts student.
“Since Megan was reported missing the University has been working closely with police and providing support for Megan’s fellow students and members of staff.
“Megan was a bright enthusiastic student, with a love of painting. She showed dedication to her studies and was popular with her fellow students as well as by all staff who met her and had the pleasure of working with her.
"She shared an area of the Art studios with a group of close friends who shared many of her interests in art and life, often mixing the two while working together on their creative projects in the evening.
"She will be sorely missed by all within the Fine Arts team and across the wider University community.
“Our thoughts are with Megan’s family and many friends at this very difficult time.”
A body found in the River Ouse on Sunday has been identified as that of missing York student Megan Roberts, police have confirmed.
Roberts' parents have now been informed, and released statements through North Yorkshire Police website paying tribute to their daughter.
Her mother, Jackie Roberts, thanked the public and emergency services for their support in the search for Megan.
"Megan was an intelligent, talented and beautiful person whose kindness and sense of humour will be greatly missed by everyone who knew and loved her," she added.
Jason Roberts, Megan's father, added: "Megan was a wonderful, kind and loving daughter who will be missed by many."
North Yorkshire Police have confirmed that a body found in the River Ouse has been identified as the missing student Megan Roberts.