LRT service through South Keys station has been halted on Line 2, and Line 4 to the Ottawa Airport has been shut down entirely, OC Transpo said Wednesday afternoon.

R2 replacement buses are shuttling passengers between Greenboro, South Keys and Leitrim stations.

Route 105 buses are running as normal between Airport and St-Laurent stations, stopping at Hurdman, Billings Bridge, Greenboro and South Keys stations.

OC Transpo has not identified the problem, nor indicated whether it's related the ongoing snowfall warning for Ottawa. The transit service first announced the shutdown around 1:40 p.m.

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