BOSTON -- Police were called to a parking lot in Hyde Park on Halloween night after a security guard reported finding internal organs on the ground.

Officers arrived at the lot at 100 Meadow Road at about 10:12 p.m. and found what appeared to be a heart, lungs and an esophagus. A medical examiner who was dispatched to the scene said she does not believe the organs are human.

The organs will undergo further testing at the medical examiner's office, police said.