The second fire in a week at the same house in St. John's has neighbours feeling uneasy.

As firefighters tackled the blaze on Sunday evening, several area residents told CBC News that the people who had been living in the house or visited there recently had made them feel unsafe.

They added that police had been called to 48 Spencer St. on a regular basis.

Just last Wednesday, firefighters doused another fire in the two-storey house, part of a series of row houses on the street.

Supt. Don Byrne of the St. John's Regional Fire Department said there was no chance that the fire had re-ignited from smouldering ruins from the original fire.

He said that going back to the scene of a fire can put crews in jeopardy.

"It's frustrating, because once you come back to a fire that's already been involved, then the questions about the structural integrity for our personnel come into question," said Byrne.

The fire was burning in the roof and was not immediately obvious to crews when they arrived. The blaze was easier to tackle when the roof was cut open.

"We had 17 personnel on site, and we needed every one," Byrne said.

It's not known whether anyone had been living in the house at the time.