MONTREAL -- Service has gradually resumed on the metro's Green Line, an hour after part of it went down due to a medical emergency.

The STM tweeted at 3:15 p.m. Thursday that it was down from Berri-UQAM to Honore-Beaugrand and was expected to resume by 4:15 p.m.

The STM said that though it is gradually resuming, delays are expected due to increased ridership.