Detectives investigating a linked series of violent attacks on women in south London have increased their reward for information to £20,000.
The increased reward is being offered by the Metropolitan Police Service for information leading to the identification, arrest and prosecution of the person responsible.
The case is set to feature on BBC's Crimewatch tonight.
On the Crimewatch programme new CCTV showing the suspect carrying out one of his violent attacks will be broadcast.
It is from an attack on December 13 last year 2015 in Hanover Park, in Peckham.
It is one of three that are linked and under investigation - the others on December, 4 last year in Commercial Way, Peckham and Friday 1 January 2016 in Creekside, Deptford.
In two of the incidents (Hanover Park and Creekside) the victims had clothing removed.
The attacks have all taken place on lone women who have been attacked from behind during the early hours of the morning.
The first attack was on Friday, 4 December 4, 2015 in Commercial Way, between 1.15am and 2.15 am. The 31-year-old victim suffered a head injury.
The second attack was on Sunday, 13 December 13, 2015 on Hanover Park, between 6.15am and 6.45am. The 30-year-old victim was assaulted and was found unconscious, lying in the street by a passerby.
The third and most recent attack was at around 5am on New Year's Day, Friday, January 1, 2016 in Creekside/Deptford Church Street. The 18-year-old victim suffered serious injuries to her head and face.
Information to 020 8217 6541 or via 101.
Alternatively Crimestoppers can be contacted anonymously on 0800 555 111 or at www.crimestoppers-uk.org.