Photo: CTV - Chopper 9

SkyTrain service was knocked out in downtown Vancouver Tuesday afternoon.

An unspecified “power issue” has shut down service in both directions on the Expo and Millennium lines, and TransLink is telling commuters to expect delays.

Trains were brought to a halt between the Waterfront to Broadway stations about 3:15 p.m.

TransLink blamed the problem on power issues at the Stadium and Main Street stations. Vancouver firefighters were also being sent to assist with near National Avenue.

CTV reports shuttle buses are being brought in to pick up stranded passengers.

Transit Police and additional security have also been dispatched to “ensure safety and crowd control.”

“Our crews are working hard to restore full service, but passengers should expect delays and allow extra travel time,” TransLink said in a statement.

– with files from CTV Vancouver