JNU case: Know why is Delhi police's action being questioned

After the incident inside the premises of Jawaharlal Nehru University, Delhi police's role and action is being questioned too. But why is it so? It is because of a statement of PRO MS Randhawa and the registered FIR. In this FIR, police got the information around 3.45 pm but Randhawa said that a call was received at 5 pm.