I had an on-campus interview with a group of employees who graduated from my school. Neither were HR people, they both worked in different functions around Amgen. They seemed to want to keep the interview short and asked very generic questions. Maybe because they were not experienced interviewers, they did not give off a friendly vibe. At the end, I asked for their email and they didn't give it out but I still got the internship. Also, be warned! They drug test through Quest Diagnostics!