Police hunting for missing schoolgirl Alice Gross, 14, have arrested a man on suspicion of murder.
The 25-year-old suspect was arrested in the Ealing area at 5pm on Saturday (6 September)
He is currently in custody at a west London police station.
A Metropolitan Police spokesman said: "All lines of enquiry are still open at this time and this remains a missing person investigation at this stage."
Alice, who suffers from anorexia, disappeared from her home in Hanwell, west London, on Thursday 28, August.
She left her home at around 1pm and was captured on CCTV an hour later on the Grand Union Canal towpath near Brentford Lock, walking towards the River Thames.
She was later filmed again at 3.45pm along the towpath heading back to her home.
The footage showed her wearing dark blue jeans, a dark green lacy cardigan and denim blue Vans shoes. She may also have had tartan-framed glasses.
Earlier, the Met Police released new pictures of cyclists riding past the spot where Alice was last spotted, shortly before her disappearance.
The grainy footage show three cyclists riding along the towpath by the Trumpers Way Canal Bridge in Hanwell, moments before Alice walks past at 4.23pm.
They are followed by two more cyclists who pass under the bridge on the Grand Union Canal.
A huge social media campaign was launched after the teen went missing
Detective Chief Inspector Andy Chalmers from the Homicide and Major Crime Command said: "I would urge everyone to take a good look at the pictures released today to see if it jogs any memories of the day Alice went missing."
A large social media campaign has been under way since the teenager went missing and hundreds of posters have been distributed around the area.
Alice's mother Rosalind Hodgkiss appealed to her daughter directly on the Facebook page Find Alice Gross, saying: "Alice if you can see this, please know sweetheart that all of us love you and miss you desperately.
"You may be sad, you may be angry, you may be hurt, you may be scared too. I just want to hug and hold you. Know that we love you and are there for you whatever you are going through.
"My love please get in touch and let someone know you are safe. Alice please come home. Mum."
Alice is described as white, 5ft 2ins tall and of slim build, with shoulder-length light brown hair.
Anyone with information can call police on 020 8358 0100; Ealing Missing Persons Unit on 020 8246 1018 or the charity Missing People on 116000.