Delhi Police has identified 37 of 60 members of a WhatsApp group called 'Unity against Left', which authorities believe is linked to last week's mob attack on JNU students and faculty, police sources said today. Around 10 of those identified so far are believed to outsiders - i.e., they are not students of the university - who took part in the brutal and unchecked assault that left 34 people injured. The sources also said groups they have linked to the violence - Left-backed student outfits and BJP-linked ABVP (Akhil Bharatiya Vidyarthi Parishad) - both took help from outsiders. They said JNU students facilitated the entry of these outsiders into the campus.