Austrian officials are investigating claims that underage asylum seekers have been sexually assaulting three schoolgirls for months without anybody taking action.
The four boys were given places at a school where it is claimed they started assaulting the girls, but it was only in the wake of the sex attacks in Cologne that one victim finally complained to police.
Police in Salzburg say they are looking now into accusations of sexual assault, grievous bodily harm and making threats.
The three youngsters from Afghanistan, aged 14, 15 and 16, as well as a Syria boy aged 16, have all been suspended after the school headmistress made a complaint to police.
According to Kronen Zeitung, the girls at Schlossstrasse Middle School were repeatedly groped but the final straw came when there was an attack so severe it forced action.
Police said the allegations dated back to last November and involved verbal abuse and suggestive comments, as well as physical violence and assaults during which the girls were touched.