Commuters taking the subway in Toronto were inconvenienced by fires for two rush hours in a row.

Southbound trains were shut down around 9 a.m. Thursday between Spadina and Union stations due to smoke on track level.

Shuttle buses ran for about 30 minutes.

During Thursday’s evening rush hour, a fire at Dupont station caused delays for passengers on the Yonge-University-Spadina line.

Both fires were considered minor and investigators were looking into what caused the blazes.

The Toronto Transit Commission said it is taking special care to make sure riders and employees are safe since the G20 riots and recent earthquake.