Twenty people were killed and 50 others injured when two buses collided Saturday in northern Syria, the official SANA news agency reported. SANA said the accident took place in the afternoon on a highway some 160 kilometers (100 miles) north of the capital, Damascus. Police officers at al-Nabek police station were quoted as saying that some 70 people were on board when the buses collided. One of the bus's tires burst, causing the driver to lose control of the coach at high speed and hit the oncoming bus head-on. Both buses were completely destroyed, with 15 people killed instantly and five others dying later at a hospital. Some of the injured were said to be in critical condition while others sustained bruises and broken bones, SANA said.