LUCKNOW, Sept. 2 -- Two railway employees were arrested for allegedly threatening a doctor and trying to extort Rs 20 lakh from him, police said on Monday. One of the two men bore a grudge against the doctor over a billing issue at a hospital where the latter worked, police added. The two suspects-Umesh Kumar Maurya (33) and Sujeet Kumar Lodhi (34)---were arrested from near Tedhi Pulia in Alambagh after an intensive probe.htc...