Detectives are preparing to question a man after the "horrific and very, very violent" death of a 23-year-old Polish student in Glasgow.
Angelika Kluk had been living in Anderston, Glasgow, since July
A murder inquiry is under way following the discovery of Angelika Kluk's body in St Patrick's church on Friday.
Peter Tobin, who worked as a handyman at the chapel, was arrested on Saturday by the Metropolitan Police on an unrelated matter.
Detectives from Strathclyde Police have travelled to London to interview him.
A spokeswoman said: "Mr Tobin has still to be interviewed. It's unclear when he will be returning to the force area."
He has been held on an outstanding warrant under Section 84 of the Sexual Offences Act 2003.
Mr Tobin was one of the last people to see Ms Kluk alive and police had appealed for him to come forward.
The Polish student had been staying in the chapel house in Anderston on a working holiday.
The languages student had been due to fly home on Monday and resume her studies at university in Gdansk.
She was last seen in the grounds of St Patrick's on 24 September and was reported missing after failing to turn up at her cleaning job the following day.
Det Supt David Swindle, of Strathclyde Police, said her body was found in the chapel's main confines.
He would not be drawn on the cause of her death or say whether she was sexually assaulted.
He added: "All I can say is it was a horrific and very, very violent attack on a young lady."
Mr Tobin became involved with the church in July under the name Pat McLaughlin through a homeless group and volunteered to carry out odd jobs.
He went missing after being questioned at the chapel last Monday by detectives, who did not know his real identity.
Meanwhile, Father Marian Lekawa, a Polish priest in Glasgow, said people have been saddened by the loss but have appreciated the support from the wider community.
He said: "We have received a lot of emails and telehone calls from Scottish people offering their sympathies.
"We are praying for Angelika and especially her family as Angelika is now in a different world and is not suffering anymore."
The Polish Consul in Scotland, Aleksander Petkow, said there had been some concern in the Polish Community in Glasgow about the way the case was handled by the police.
However, he was also keen to stress that the sympathy being shown by Scots to the Kluk family meant that there would not be any damage to relations between the two communities.