Patna, Feb. 19 -- Bettiah, Feb 18 The forest department in Bihar is searching for a tigress that has so far killed three people including a couple in the Valmikinagar Tiger Reserve area of West Champaran district. Meanwhile, another tigress has been spotted with cubs that has raised tension in the department. "Footprints of tigress and cubs have been found near the anti-poaching camp. Tiger-trackers have been asked to keep track of them. A cage has also been placed near Khairatiya village to catch the tigress," said VTR Director Hemkant Rai, adding that experts have also been called from Patna. A couple Aklu Mahato and Rukhi Devi were killed by the tigress about a week ago in Suryapur Parsauni in East Sahodara. Earlier, the same tigress h...