The first attack on the 17-year-old occurred on September 29 at 23:55 local time in east London's Bethnal Green district.
Shortly after midnight, a surveillance camera in a nearby street showed a girl walking down Mint Street. She was followed by a bearded man with a bicycle who is suspected of sexually assaulting the girl in a separate attack.
About 00:45 local time on September 30, she was attacked for the third time. According to investigators, two or three men could have participated in the assault. A few minutes after the criminals disappeared, passers-by noticed a girl lying on the street and called the police.