KRISHNAGIRI: Two persons were killed and two others sustained severe burn injuries after two motorcycles collided head-on and burst into flames near a toll plaza in Mathur police station limits of Uthangarai subdivision in Krishnagiri district on Monday morning.According to Mathur police, the accident occurred around 7.45 a.m. in front of Prabhu Hotel near the Nagampatti toll plaza. “A motorcycle carrying two persons was travelling from Krishnagiri towards Tiruvannamalai when it collided head-on with another motorcycle coming from the opposite direction,” said an officer.The impact caused the fuel tank of one of the vehicles to explode, triggering a fire that quickly engulfed both motorcycles and their riders. “Two persons were charred to death at the spot,” the officer stated.Among the injured, Velu (27), son of Sadasivam, who was travelling on one of the motorcycles, is undergoing treatment at the Mathur Government Hospital. Another victim, Thirupathi (30), son of Ramesh, from Dharmapuri, suffered severe burn injuries. After receiving first aid at the Mathur Government Hospital, he was referred to the Krishnagiri Government Medical College and Hospital for further treatment.Mathur police rushed to the spot, recovered the bodies and sent them to the Krishnagiri Government Medical College and Hospital for post-mortem examination. A case has been registered and investigations are under way.Police officer said one of the motorcycles involved in the accident bore registration number TN 09 F 4626, a Bajaj vehicle. The other motorcycle was completely gutted in the fire, making it impossible to immediately ascertain its registration number.The identities of the two persons who died in the fire are yet to be established.