Hundreds of angry students who had to appear for an entrance exam for Bihar-Police threw-stones at a train, blocked rail and road traffic in Hajipur, about 21-km from Patna, as they accused the administration of not running special-trains for them. Protests spiraled-out of control as students who had applied for the post of constable attacked the Delhi-bound-Rajdhani-Express from Guwahati and threw stones at it.