German police released the offender back into the public after he was arrested in connection to the New Years Eve chaos on December 31, 2015 in Germany.
The man was arrested by police on suspicion of sexually attacking a woman in Hamburg on New Year's Eve.
Now German officers have confirmed the migrant is once again being investigated for his role in an alleged sexual assault on December 31, 2016.
Known as Mahmud A, a 42-year-old refugee from Syria, he is said to have sexually harassed, assaulted and abused women in the city centre of Hamburg, according to both the police and the prosecutor's office.
Protesters went to the streets after the German New Years Eve chaos in January 2016
Local media has reported the attacker even boasted about groping women on New Year's Eve in 2015 to other inhabitants of the housing facility where he stayed.
He was later arrested by authorities and interrogated several times.
Despite police taking a DNA sample from the man in February to investigate other possible crimes, the proceedings were closed because he could not be identified by witnesses and the case was dropped due to a lack of evidence.
However, on December 31, 2016, Mahmud A is accused of groping a woman in Hamburg's red light district.
Fireworks were launched during the chaos in which thousands of women were sexually assaulted
Prosecutors say he assaulted his first target at 11.30pm in the St Pauli neighbourhood of the city, known for its nightlife.
Police officers spotted the man during his attack and manage to arrest him.
A police officer told local media: "This case shows the whole dimension of the sexually motivated violence of this clientele.
"If we had not been there with a concentrated presence, it would have escalated again."
A local newspaper has also reported the Syrian man has come into contact with police over thefts.
Crowds of men were captured in Cologne during the chaos which police couldn't control
Cologne: Sex Attacks and Robberies
Tue, January 12, 2016
Thirty-one suspects, including 18 asylum seekers, are under investigation over offences including sexual assault and theft in Cologne on New Year's Eve. Far right protestors in Lepzig have rallied against refugees and German chancellor Angela Merkel.
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Protestors in Lepzig rally after over 100 women were sexually assualted on New Year's Eve
New Year's Eve chaos in Cologne on December 31, 2015 saw hundreds of allegations of sexually assault made.
A total of 1,600 crimes were reported on the night, most of them sexual assaults and robberies.
Angela Merkel has been criticised heavily since the sex attacks as many of the men involved were thought to be migrants who had entered Germany in 2015.
The German Chancellor has since made a massive U-turn with her views on immigration.