Los Angeles County police launched an investigation after a pair of lungs was found on a sidewalk in the south of the city.

A passerby alerted authorities after discovering what she thought were lungs at around 8:30pm local time Sunday, Sgt. Robert Dean told the Los Angeles Times.

A coroner's office official was called to the scene. Further tests will be carried out to determine whether they are lungs and if they are human.

Dean added, "We don't know what they are. It's really weird."