2 women's bodies bound together discovered floating in New York's Hudson River: Police

The circumstances of the deaths remain a mystery.

A passerby saw two bodies floating in the water and contacted authorities.

While officials said that the bodies were taped together, the circumstances surrounding the incident remain unknown, officials said.

A law enforcement source told ABC News that the two bodies were female and fully-clothed, with no signs of trauma.

The bodies are believed to have washed ashore with the tide and stayed when the tide went out.

The New York City medical examiner's office will determine the causes of death, and identifications of the bodies are pending family notification, officials said.