From Harmeet Shah SinghCNNNEW DELHI, India (CNN) -- Federal police arrested two Roman Catholic priests and a nun Wednesday in the 16-year-old killing of a nun whose body was found in a well in southern India.Police have arrested the Revs. Thomas Kottor and Jose Poothrikkayil and a nun known as Sister Sephy, said Harsh Bhal, a spokesman for India's Central Bureau of Investigation.The three have been arrested in the death of Sister Abhaya, whose body was found in a well in the southern Indian state of Kerala in 1992. Her full name was unavailable.Defense counsel Chullutharayil Padmanabhan Udaybhanu insisted his clients were innocent and that he would challenge their arrest in a higher court.The arrest follows 12 previous attempts to crack the case, according to CNN-IBN, a CNN sister network in India.The Central Bureau of Investigation took over the case from state police in 1994, Bhal said.
