They first assumed the taxi driver was having a dispute with a passenger and that they'd have to intervene.
But it turned out to be a different kind of emergency altogether.
"It's pretty surprising when you approach the vehicle, and you expect to resolve an [argument] and then see a baby coming out," said Const. Raphael Bergeron of Montreal police.
They delivered the baby just after 1 a.m. on Décarie Boulevard near Côte St-Luc Road. By the time all was said and done, paramedics arrived to transport the baby and mother to hospital.
Bergeron said both infant and mother are in good condition.