The TTC's Line 1 is operating normally again after a morning power outage suspended service on Line 1 between St. George and Lawrence West Stations.

In addition to affecting the TTC, approximately 2,400 customers were left in the dark when the outage began at about 4:19 a.m. Power was restored to all customers just after 6:10 a.m.

TTC riders board shuttles at Lawrence West station which go to St George where subway service resumes. Power outage. <a href="https://twitter.com/hashtag/Toronto?src=hash">#Toronto</a> <a href="https://twitter.com/CBCTrafficTO">@CBCTrafficTO</a> <a href="https://t.co/ZYL1KX4PJH">pic.twitter.com/ZYL1KX4PJH</a> —@LateNightCam

The affected area was bounded by Dufferin Street to Avenue Road and from St. Clair Avenue West to College Street.

A spokeswoman for Toronto Hydro, Christina Basil, said the outage was due to a loss of power supply from Hydro One to one of its stations.

The exact cause is unknown at this time, she said.