Were they in the river? I thought I read one story that said, "no, that did not happen".
New York police: Saudi sisters spoke of harming themselves
...
New York City Police Chief of Detectives Dermot Shea said people who knew the Farea sisters in Virginia told investigators that they made statements within the last year indicating "that they would rather inflict harm on themselves — commit suicide — than return to Saudi Arabia."
Shea stopped short of saying that the sisters had killed themselves but said police have "no credible information that any crime took place." The medical examiner has yet to rule on their death and the case remains under investigation, he said.
Read more at: http://www.baynews9.com/fl/tampa/ap-top-news/2018/11/02/police-no-sign-of-assault-in-saudi-sisters-nyc-deaths
This story also mentions that a bystander saw them praying together, a few hours earlier, with their heads down. But... they still don't have an exact cause of death and that is what law enforcement is suppose to find out. I don't fault LE in this. I'd think they would have found anything obvious, if it were drowning, drugs, and so on and no signs of foul play.