A security guard has been convicted of sodomy against two men and indecently assaulting two others in Glasgow.
Hissein Atie prowled the city's streets looking for men to attack, the High Court in Glasgow heard.
The 30-year-old, who was caught by DNA evidence, committed the offences between January and June last year.
Sentence was deferred for reports and Atie, who arrived in the UK from Chad in 2000, was placed on the sex offenders' register.
Judge Ian Peebles QC said he would consider deporting Atie to the Central African country.
At the time of the last attack, he had been granted bail for police assault and alleged indecency.
He was also being sought by the Home Office, who wanted to remove him from the country after his asylum application failed.
"He is incapable of self control in sexual matters"
Prosecutor Dorothy Bain QC said: "He is a sexual predator and a complete and utter danger to the public.
"He can sense his victims' vulnerability and singles them out for attack.
"He uses violence and he is incapable of self control in sexual matters."
Atie's first victim was a 21-year-old man who was in a distressed state in Glasgow's Buchanan Street in January last year, after an argument with his partner.
Atie asked the man if he was alright before dragging him into Springfield Lane where he was sexually assaulted.
The man managed to run away and was later found by his partner curled up in a shop doorway and so distressed that he was unable to speak for five minutes.
His second victim was found by police wandering the city centre streets in May last year, after he was beaten and sexually assaulted by Atie.
Distressed state
The 23-year-old, who was upset after a row with his girlfriend, was taken by Atie to a flat, where he was attacked.
His third victim, an 18-year-old, managed to run away after Atie tried to prevent him leaving his flat last June.
Atie offered his fourth victim accommodation for the night, after he found him in a distressed state in the city's George Square last July.
He took the 23-year-old to his flat in Meadowpark Street.
The man woke up to find Atie committing sodomy on him.
After his ordeal he managed to phone the police who arrested Atie at his flat.
He had denied all the charges against him and claimed the DNA evidence had been planted on him.
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