A quick-thinking member of the public who filmed a “dangerous” sexual assault suspect fleeing the scene of an attack was pivotal in securing his conviction.
Mentesnot Cheru, 29, has subsequently been jailed for committing terrifying sexual attacks against two women in London.
He was identified thanks to witness Joshua Donka, 20, who was passing in his car and caught Cheru on camera following the first assault.
A month later, Mr Donka spotted Cheru again before following him to his home and calling police.
He was sentenced to two years and eight months in prison, with an extra three years on extended licence.
Cheru had pleaded guilty to two counts of sexual assault and a charge of possessing cannabis at an earlier hearing.
He was also ordered to sign the sex offenders register for life.
Both of the random attacks took place in Tottenham, minutes apart on the morning of April 4.
As he announced his ruling at Wood Green Crown Court, Judge Gregory Perrins told him: "You are plainly and simply a dangerous man."
"They both involved random attacks on lone women,” said the judge.
“You deliberately targeted them and saw them as vulnerable women walking alone in the street."
The court heard that his first victim, 20, was on her way to work when she was attacked by Cheru.
He then called her a "f****** bitch" and punched her five times in the face and shoulder.
Minutes later, Cheru attacked another woman, 27, in a nearby street.
"I was suddenly slapped hard on my bottom from behind and it was really hard. I immediately turned around to see who had done that to me. He then punched me in the face once," the second victim told police.
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Mr Donka used his mobile phone to film Cheru, who was holding a tennis racquet as he fled, following the first assault.
The 20-year-old, who was driving past when he spotted the assault, chased Cheru but he escaped.
When Mr Donka recognised Cheru a month later on May 3, he followed him and managed to get an address, prosecutor Sherry Nabijou told the court.
Cheru has a string of previous convictions, including a seven-year jail sentence in 2010 for stabbing a police officer in the back in Croydon.