Goa, Oct. 24 -- At least 19 people were killed and several others injured when a bus caught fire after colliding with a motorcycle on a highway in Andhra Pradesh early Friday.According to reports, the motorcycle got trapped beneath the Bangalore-bound bus, rupturing its fuel tank and sparking a massive explosion. The vehicle, carrying around 40 passengers, was engulfed in flames within minutes.Eyewitnesses said passengers screamed for help as locals rushed to rescue them. Some survivors managed to escape through the emergency exit window. The bus driver and cleaner fled the scene.Authorities have launched an investigation into possible fuel leakage and negligent driving. Most passengers, who boarded from Hyderabad, were asleep when the fi...