Two months ago, the mother reported Tala as missing, but later withdrew the report after the teenager was found visiting her sister in NY. Both were clothed and had black jackets with fur trim, police said.
According to the New York Post, NYPD Chief of Detectives Dermot Shea said on October 25, "They were not in the water that long".
The deceased women were identified as Rotana Farea, 22, and her sister Tala Farea, 16, after sketches of the girls were circulated in news reports.
According to U.S. media, the police do not have convincing answers about the mysteries revolving around the tragedy that happened to the young women.
NY and Arab media said the sisters, who had run away from home before, were of Saudi origin but their family was living in Fairfax, Virginia.
After the discovery of their bodies, the NYPD asked for assistance in identifying them and put out a sketch of the pair.
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The sisters were Saudi citizens and students who were accompanying their brother in Washington, the Royal Consulate General of Saudi Arabia in NY said Tuesday in a statement.
"We are looking at all clues in their past life", Shea said on Tuesday. Rotana was enrolled at George Mason University, but left in the spring.
Fairfax police confirmed to DailyMail.com that at least one Farea sister was reported missing by family. "They never had any issues and the eldest was sent to college in New York City with her family's blessing", says the relative, who rejects suggestions that the sisters died in a suicide pact.
Tala and Rotana moved to the USA from Saudi Arabia with their mother in 2015, settling in Fairfax, a suburb of Washington D.C., police said. Rotana was possibly with her sister, according to the alert, which has since been removed.
The Saudi consulate in NY has said they are following the investigation. The lack of obvious trauma appeared to rule out a theory they may have jumped into the river from the George Washington Bridge.
Tala had been reported missing to the National Center for Missing and Exploited Children on August 24, the New York Daily News said.