Unsurprisingly (given the attacks they're facing) an internal police report has been leaked discussing the events at Cologne and the police response. Spiegel has an article on it here but there are better ones elsewhere - mostly in German, though.
Also many sources are now reporting that two young girls from Weil am Rhein, ages 14 and 15 (I've seen the older girl's age also being reported as 16 in certain sources) were raped multiple times by a group of Syrian refugees on New Year's Eve. 4 suspects are apparently on remand.
According to our Dutch newspapers, one of the perpetrators apparently was a 14 year old Syrian refugee from the Netherlands. He travelled to Germany to celebrate New Year with 3 other Syrians.
Those celebrations inculded the gang rape of two very minor girls, age 14 and 15, at the appartment of a 21 year old Syrian who had already gotten his asylum status granted in Germany, and who shared his appartment with his 15 year old brother, who is still in the procedure of applying for asylum. A fourth person was also arrested in the case, a 14 year old Syrian from Switzerland. It is not yet known what the relation between those boys/men is, whether they are all related, or just acquainted.
I'm sure the 3 minors will just get a reprimand, and no consequence for their asylum status. Our Child Protection Laws will make sure of that. The 21 year old guy will probably be airdropped back over Syria after spending a few years in a German prison with a 'pedofile' tattoo on his forehead though.