According to police, the person of interest was taken into custody at The Franklin Institute on Friday afternoon. No charges have been filed.
Police say the gruesome discovery was made at a South Philadelphia home on Friday morning. A bloody knife with a large blade was found next to the freezer.
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According to investigators, family members had come to the house on Friday morning to check on other family members they had not heard from.
When they got to the row home, they found blood inside and called police shortly before 6:30 a.m.
Arriving officers found what appears to be the body of a male, curled up and face down in the freezer box.
Police said the person of interest, who is now in custody, is the victim's son.
"The position the body is in - face down, curled up, with a bag over his head - we're not even certain who this person is," said Philadelphia Police Chief Inspector Scott Small.
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Police said a father and his adult son often stay at this address. It is unclear if anyone lives at the home day-to-day.
According to investigators, there was no sign of forced entry, and the property does not appear to be ransacked.
"Someone may have entered this property or exited this property and committed this crime, and we did find numerous cameras on both sides of the street," said Small.
Neighbors were stunned.
"It's right around the corner from me. This is crazy around here, and this is a quiet neighborhood around here," remarked Yusuf Mitchell of South Philadelphia.