The fire that gutted a vacant mansion in Vancouver's tony Shaughnessy neighbourhood this weekend has been deemed suspicious.

The blaze broke out just before 3 a.m. Sunday at a home in the 3700 block of Angus Drive. A neighbour called 911 after seeing smoke and flames coming from the 6,000 square foot home.

Investigators have determined the fire is suspicious, according to police, and firefighters and police are working together to determine what happened.

Neighbours told CBC News the home had been vacant for years before the blaze.

The home was empty at the time of the fire, and no one was injured.