Five friends were killed and two others injured when their car crashed into a tree in Haryana's Sonipat, police said on Saturday. The victims were returning to Rohtak after attending a wedding in Gohana. The deceased, identified as Sagar, Deepak, Sahil, Mohit, and Ankush, aged between 22 and 27, were residents of Khidwali and Ghuskani villages in Rohtak district.