German leaders expressed shock over dozens of apparently coordinated sexual assaults against women on New Year's Eve in the western city of Cologne blamed on "Arab-looking men," but warned against anti-migrant scapegoating.<br />Chancellor Angela Merkel called for a thorough investigation of the "repugnant" attacks, ranging from groping to at least one reported rape, allegedly committed in a large crowd of revellers during year-end festivities outside the city's main train station and its famed Gothic cathedral.<br />Merkel's spokesman Steffen Seibert said she had called Cologne's mayor, Henriette Reker, to express her "outrage" over the violence, which she said required "a tough response from the state."<br />Police in Cologne said they had received 90 criminal complaints by Tuesday and quoted witnesses as saying that groups of 20-30 young men "who appeared to be of Arab or North African origin" had surrounded victims, assaulted them and in several cases robbed them.