Four people were injured in a series of bombings that rocked south Thailand\'s Narathiwat and Yala province, the Bangkok Post reported Monday. The first bomb in Narathiwat was covered under a tree truck and went off around 6:30 a.m. local time when a village defense volunteer on duty stepped onto it. The volunteer was badly injured with a broken right leg. Another bomb was hidden in a rubber plantation and ignited accidentally by two teenage boys. They were seriously wounded and one of them lost his left foot. A third bomb rock another district of the province and caused no casualties. Later in Yala, a bomb hidden on a highway was ignited and seriously damaged a nearby police patrol car. One of the two officers in the car was injured in the face and rushed to a hospital. It was reported that about 14 bombings had rocked Narathiwat from 6 p.m. to 9 p.m. on Sunday and fortunately nobody was hurt. CCTV cameras showed that some newly recruited youths of local insurgency movement were behind the spree. Southernmost provinces of Yala, Pattani and Narathiwat have frequently experienced violent incidents instigated by suspected secessionists since the resurgence of insurgency movement in January 2004, leaving over 4,500 people killed and more than 7,200 injured.