Emergency crews responded to an incident with a Delta Air Lines flight in Toronto on Monday.The Bombardier CRJ900 was flying from Minneapolis, operated by Delta's Endeavor Air.All passengers and crew were "accounted for," the airport said, but their conditions are unknown.Emergency crews responded to an incident involving a Delta Air Lines flight at Toronto Pearson Airport on Monday afternoon.All passengers and crew were "accounted for," the airport said. A Peel Regional Police spokesperson said the Greater Toronto Airports Authority was investigating.Photos on X appeared to show the plane upside down and at least one wing missing. Delta said there were 76 passengers and four crew onboard."Initial reports were that there are no fatalities," Delta said. "Several customers with injuries were transported to area hospitals. Our primary focus is taking care of those impacted."Ornge, an air ambulance service in Ontario, told Business Insider that three people were transported to Toronto hospitals with critical injuries, including a child, a man in his 60s, and a woman in her 40s.US Secretary of Transportation Sean Duffy said in an X post that investigators with the Federal Aviation Administration were traveling to Toronto and that the Transportation Safety Board of Canada would lead the investigation.The Bombardier CRJ900, which was flying from Minneapolis as Flight 4819, was operated by Delta's wholly-owned regional subsidiary, Endeavor Air.Flights to the airport were halted due to the emergency, and there are no updates yet on when they may resume. The airport remains closed.Delta said that it is working with customers flying from, to, or through Toronto and that customers should check their flight status via the Delta app.A bad few months for aviation safetyThe Delta incident comes two and a half weeks after an American Airlines flight collided with a military Black Hawk helicopter over Washington D.C., killing 67 people.The event in Toronto highlights the ongoing concerns over aviation safety. Despite the incident happening in Canada, the plane was operated by a US airline regulated by the FAA.On Monday, the Trump Administration fired hundreds of FAA staff, according to the workers' union, including people in the safety department.Among those fired was Jason King, whose work directly involved addressessing safety concerns, the Washington television station, WUSA, reported.He said his team's work included investigating the mid-air collision over D.C. The Trump Administration's move to fire hundreds of FAA employees follows the fatal American Airlines crash in January. Al Drago/Getty Images The Delta and American flights join a string of aviation safety events since December. An Azerbaijan Airlines Embraer plane crashed on Christmas Day in Kazakhstan, with some blaming Russian air defenses. Thirty-eight people died.A few days later, a Boeing 737 operated by the South Korean budget carrier Jeju Air crashed in South Korea. 179 people died, and two people survived.A small general aviation plane crashed in Pennsylvania a few days after the American accident, killing six on the plane and one on the ground.And on February 6, an Alaskan regional airline crashed in western Alaska, killing 10 people.