Delhi Police have registered an FIR in connection with a clash between two groups of students in the Jawaharlal Nehru University (JNU) campus, allegedly over non-vegetarian food being served in the hostel mess on the occasion of Ram Navami, officials said today. At least sixteen students from both sides - Jawaharlal Nehru University Students' Union (JNUSU) and Akhil Bharatiya Vidyarthi Parishad (ABVP) - were injured as chaos reigned on the campus yesterday evening.