Train service is temporarily suspended on Line 4 to Ottawa's international airport, according to OC Transpo.

Route 105 Airport bus service is running between Airport and South Keys stations.

A stopped train halted service along the four-kilometre spur line on Sunday evening.

OC Transpo hasn't shared details about the problem.

The interruption coincided with the significant snowfall of the season, with Environment Canada recording 11.7 centimetres of snow at the airport on Sunday.

The long-awaited extension launched in January.

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