A passenger bus traveling from Gaya in Bihar to Ranchi overturned on the NH33 near Patel Chowk in Ramgarh Suburban Area on Friday, injuring around 20 passengers. Four of the passengers sustained critical injuries and were admitted to the Ramgarh Sadar Hospital. Officer-In-Charge, Barlanga Police Station, Vidya Shankar said the bus carrying at least 40 passengers was on the way to Ranchi via Ramgarh when it overturned.