05/28/2013 10:05 EDT | Updated 07/28/2013 05:12 EDT

Montreal metro service on green line gradually resumes

Service is gradually resuming on the metro's green line after a 20-minute interruption on the Montreal metro this morning.

Montreal's STM reported an interruption at about 9 a.m. on its green line between Lionel-Groulx and Frontenac stations.

The public transit corporation's twitter feed reported the disruption was caused by smoke.