CNN — Two young boys sleeping over at a friend's place Monday night were dead by Tuesday morning.
Officials in New Brunswick, Canada, say a 13-foot snake killed the boys while they slept.
A friend of the two boys lives at this apartment above his father's pet store, where he sells exotic reptiles.
Sometime after the boys went to sleep, one of those reptiles escaped.
Canadian Royal Mounted Police say a 100-pound python escaped its enclosure, crawled through the ventilation system into the apartment above the store, and strangled a five-year-old and a seven-year-old boy.
Alexandre Remblay sells exotic snakes in Montreal and says it's rare for a snake that big to escape its enclosure.
"The snake was probably way under-fed and badly housed," said Remblay. "For a snake to be able to get out at that size, it just has to be really hungry and not in good conditions."
Others are not as surprised.
The RCMP has started a criminal investigation.
Autopsies for the two boys will done, this morning.