Toronto Fire crews are battling a 4‑alarm industrial blaze in the city’s west end early Tuesday, a fire that sent heavy smoke across Hwy. 427 and forced multiple road closures.The fire broke out around 3:58 a.m. at 156 Disco Road, inside a large waste‑processing facility known as the YORK1 Disco Transfer Station. Toronto Fire confirmed the escalation to a 4‑alarm shortly after 4 a.m.Toronto Fire officials tell CityNews the fire originated inside the building, though investigators have not yet determined the exact source. As the fire intensified, concerns grew over the structural integrity of the facility.No injuries have been reported.Toronto police say visibility on Hwy. 427 may be affected, urging drivers to use extreme caution.Disco Road is closed between Carlingview Drive and Hwy. 427, while Attwell Drive is also fully closed.Toronto Fire says Commander John Carson will provide an on‑scene update at 7:30 a.m.