A 45-kilo python blamed for the strangling deaths of two Canadian boys apparently escaped from its pet store enclosure, slithered through a ventilation system and fell through a ceiling into the room where the young brothers were sleeping, the shop’s owner has said.

Post-mortem examinations on the brothers, aged five and seven, are being performed this morning.

They had been visiting the apartment of a friend above an exotic pet store in Campbellton, New Brunswick, said Royal Canadian Mounted Police Constable Julie Rogers-Marsh.

She said the snake apparently escaped during the night and made its way into the apartment through the ventilation system. A friend of the boys was sleeping in another room and was unharmed, she said.

A friend of the boys was sleeping in another room

The pet store owner, Jean-Claude Savoie, told the Global News television station that he did not hear a sound and discovered the “horrific scene” when he went into his living room, where the two boys had been sleeping, on Monday morning.

“I can’t believe this is real,” Savoie said. The boys were the children of his best friend and were often at his apartment to visit his son, he said.

The python, which he has had for at least 10 years, had been kept alone in its enclosure and was not handled by anyone else, he added.

The snake is about 4.5 metres long, Sergeant Alain Tremblay said. He said police are looking at whether the store followed the province’s regulations on exotic animals.

“It’s a criminal investigation,” Sgt Tremblay said. “We’re going to look at all avenues.”

The town’s deputy mayor, Ian Comeau, said the Reptile Ocean shop was licensed to operate and “everything was according to our bylaws, to the provincial guidelines”. He said he saw alligators, crocodiles and snakes when he toured the shop with the fire department about two years ago.

Snake expert John Kendrick, a manager at the Reptile Store in Hamilton, Ontario, said it sounds like the python was not enclosed properly and might have been spooked. He called the strangling deaths “very unusual” but said African rock pythons tend to be highly strung.

“It’s very odd that one would go out and seek out a person. They don’t recognise us as food,” he said.

It is possible that the python was just holding on to what it landed on, Mr Kendrick said.

Pythons can sense heat, and if they are startled they can grab something, he added. He said snakes are very long and their muscles run lengthwise through their body, so they are not very stable unless they are holding on to something.

Stephanie Bernatchez, who shares a mutual friend with the boys’ mother, identified the children as Noah and Connor Barthe.

“We’re all overwhelmed here,” Bernatchez said. “They could have been hit by a car, but a snake? That’s not something people around here expect.”

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