A blue bag that washed up on Pier 14 is being investigated by police and San Francisco's Medical Examiner, after a passer-by noticed bones — perhaps human ones — spilling out of its opening.

According to KRON 4, a man walking his dog along Pier 14, which is located just off the Embarcadero between Howard and Mission Streets, "noticed a backpack and called authorities after he spotted what looked like bones inside the bag."

KRON 4 reports that "There were also payroll receipts inside the bag that have been collected for evidence."

Of course, this isn't the first time that Pier 14, a popular San Francisco tourist attraction, has been the scene of a police investigation: In a case that made international headlines, on July 2 of last year, SF resident Kate Steinle was allegedly shot at random by Juan Francisco Lopez-Sanchez.

Two TV news crews were subsequently attacked and robbed on Pier 14, as they reported on the shooting. The suspects in that case were arrested in August of last year.

When contacted by SFist, a Medical Examiner's staffer confirmed that their office had been called to Pier 14 this morning, but could not provide any details on the investigation. A call to the San Francisco Police Department for further information was not returned at publication time.