Two units are uninhabitable, and the residents are being provided assistance.

A townhouse fire in Barrhaven has damaged two units and forced the occupants to spend the night elsewhere.

The fire started around 10:30 p.m., Thursday, at a home on Ambiance Drive.

The roof and second floor were badly damaged by the fire.

No one was hurt, but neighbours helped an elderly woman out of an adjoining townhouse unit.

Two units are uninhabitable, and the residents are being provided assistance.

Neighbours called 911 to report the fire, and the area's MPP, Goldie Ghamari, tweeted that the fire began after a lightning strike.

My neighbour's roof caught on fire after being struck by lightning during tonight's storm. Huge thanks to @OttFire, @OttawaPolice, @OttawaParamedic & all first responders for responding so quickly and making sure that everyone is ok. #ottweather #ottnews #Ottawa pic.twitter.com/zerXU2G4KO — Goldie Ghamari, MPP 🇨🇦 (@gghamari) June 28, 2019

The official cause of the fire, and the damage total, have not yet been determined.