Ongole, Four persons were killed and one injured when the car in which they were travelling rammed into a stationary truck at Martur in Prakasam district on Thursday.Police said that the deceased Chinna Babu, Parvataneni Venkata Vijayalakshmi, R Kanaka Mahalakshmi, Balija Satyanarayana were going to Eluru from Tirumala. Their car rammed into a stationary truck from rear end killing them instantaneously. The injured person was shifted to the RIMS hospital.The deceased belonged to Eluru. The police registered a case and shifted the bodies to the government hospital for post-mortem.