New York police were still trying to piece together on Wednesday a mystery over two young women whose bodies were discovered a week ago on the rocky Manhattan shore of the Hudson River, bound together with duct tape around their waists and ankles.

Since then, New York City police have determined that Tala Farea, 16, and Rotana Farea, 22, were sisters from Saudi Arabia living in Virginia, and at least one of them was reported missing two months ago.

The city's medical examiner has yet to determine the cause of death, be it a double homicide or a suicide pact. The medical examiner's office said the bodies were not decomposed when found by a passer-by on the afternoon of Oct. 24, indicating they had not been dead long.