Shea released new images of the Farea sisters, which he said were obtained with the cooperation of the family.
In a statement, the Saudi consulate-general said embassy officials in Washington had contacted the family and "extended its support and aid in this trying time", and noted that the sisters were students "accompanying their brother in Washington".
The medical examiner's office will determine the causes of death as the investigation continues.
"They were not in the water that long", NYPD Chief of Detectives Dermot Shea said last week, according to the New York Post.
"We are looking at all clues in their past life", Shea said.
DailyMail.com has learned Rotana, from Jeddah, Saudi Arabia, was an undergraduate at George Mason University from January 2016 until May of this year.
But there's still few public details about either sister's past. Their bodies, which had no obvious signs of trauma, were discovered about 225 miles away from Fairfax, Virginia, where they lived and vanished in August.More news: The Trump administration takes on drug prices
Almost a week after two Fairfax County sisters were found dead along a riverbank in New York City, mystery still surrounds their deaths.
The Virginia-based mother said the Saudi embassy in Washington called her on October 23 alerting her that the family's residence in America was in jeopardy because of the asylum applications, reported the New York Post.
The Week's Ryan Cooper likened the Farea sisters' death to the 1976 car-bombing and assassination of Chilean dissident Orlando Letelier-an assassination which was carried out with the full knowledge and tacit acceptance of top US policymakers, including then-Secretary of State Henry Kissinger, according to the Washington Post.
The Saudi consulate in NY said that the Consulate General is keeping close tabs on the investigation.
A passerby called 911 at 2.40pm on Wednesday after spotting the two bodies, which were found laying on rocks by the river when police arrived at the scene. The lack of obvious trauma appeared to rule out a theory they jumped into the river from the George Washington Bridge.
Anyone with information is urged to call CrimeStoppers at 800-577-TIPS.
Furthermore, a Saudi official at the kingdom's embassy in Washington DC categorically denied to Arab News that the embassy had made any calls to the mother with regards to her alleged daughters' political asylum claim.