A serious crash has closed a section of Highway 400 in North York.Emergency crews were called to the area Saturday morning for reports of a serious crash.All northbound lanes of the highway are closed at Finch Avenue for an investigation.#listen-box { box-shadow: 0 0 0 0 rgba(0, 0, 0, 1); animation: pulse 2s infinite; margin: 20px; padding: 15px;}@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(200, 16, 46, 0.7); } 70% { box-shadow: 0 0 0 10px rgba(200, 16, 46, 0); } 100% { box-shadow: 0 0 0 0 rgba(200, 16, 46, 0); }} CLICK HERE TO LISTEN TO LIVE COVERAGE OF THIS STORY!No injuries were immediately reported.“Please use alternate routes and anticipate traffic delays in the area,” OPP wrote in a social media post. “Expect a prolonged closure during the investigation and clean-up efforts.”This is a developing story. Check back for updates.