Montreal metro resumes after service shutdown

Montreal'sunderground metro system came to a grinding halt Saturday morning because of computer problems.

The breakdown was initially reported just after 10 a.m.

All lines green, orange, blue and yellowwere disrupted for nearly an hour.

Service was gradually restored to the green, orange and blue lines at 11 a.m.

Montreal's transit authority STMdispatched shuttle buses to certain stations.

A similar outage happened June 20 during rush hour, because of computer problems.