Cars are lined up outside Pearson International Airport on April 24,, 2025 due to a heavy police presence in the area. (John Fowler/ Submitted) Travellers say there is a heavy police presence at Toronto Pearson International Airport this morning following an unknown incident. Paramedics said they were called to the airport shortly after 7 a.m. but would not disclose the nature of the call or what terminal emergency crews are responding to. Cars could be seen lined up outside the airport early Thursday morning. In a social media post, Ontario Provincial Police say Highway 409 to Terminal 1 Departures in closed for a police investigation. This is a breaking news story. More details to come.