 Complete the following phrase:  Vigilantism against immigrants is considered to have become more widespread after the sexual assaults by migrants in Cologne and other German cities on New Years Eve 2015. In January 2016 a mob attacked a group of Pakistanis in Cologne, and at Bautzen in February, an arson attack on a hostel for asylum seekers took place In February 2018, in Heilbronn, a 70-year-old man knifed three immigrants while drunk, in a protest about the current refugee policy. A perceived increase in attacks on immigrants led to Chancellor Angela Merkel condemning anti-immigrant vigilante groups following the 