Media reports say some 30 witnesses have been gathered, and the charges have been detailed in a document running into more than 1,000 pages.
Outraged Indians have been demanding the death penalty for the six men, holding demonstrations almost every day since the rape. Murder is punishable by death and rape by life imprisonment. But juveniles—those below 18 years of age—cannot be prosecuted for murder.
Another police officer said a bone test is being conducted to determine if the youngest suspect in the case is indeed a juvenile.
