It is unclear if the body parts came from one person or several, police say

A suitcase containing “dismembered body parts of a human being,” was found outside the Twitter headquarters in San Francisco on Wednesday, police say.

The horrific discovery was made when officers responded to a call of a suspicious package just after 4 p.m., according to the San Francisco Chronicle.

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Police found a roller-type suitcase that had been left next to a pile of garbage at the corner of 11th and Market Streets, police spokeswoman Grace Gatpandan said.

The body was so mutilated that cops had to call in a medical examiner to determine if the remains were human or animal, USA Today reports.

“Investigators are still searching to determine if there are any other body parts in the area,” Gatpandan said Wednesday evening. “This was an extremely gruesome crime scene.”