Officials are looking into what caused a charter bus used to transport workers to the Shell cracker plant in Potter Township go up in flames on a busy road this morning. The fire broke out around 8 a.m. along Frankfort Road, also known as Route 18, as the bus was heading to the plant. The bus was consumed by flames. Emergency equipment was brought in to help put out the fire and clear the scene, blocking the right lane of the roadway. No one was injured.