A four-member government-appointed panel will probe the school bus crash that killed six students and injured around 20 in Haryana's Mahendragarh on Thursday. The accident took place near Unhani village in Kanina, when the bus, carrying around 40 students from primary to secondary classes to the GL Public School, collided with a tree and overturned, police said. An FIR has been registered in connection with the case.