Bus carrying 150–200 migrant workers and their families from Punjab and Haryana to Bihar overturned in Sambhal; police probe alleged overloading and negligent driving. More than 20 passengers sustained injuries after an overcrowded double-decker sleeper bus heading from Punjab and Haryana to Bihar overturned in the early hours on the Ganga Expressway in Uttar Pradesh’s Sambhal district, an official said here on Wednesday.