Toronto Fire is investigating another incident involving lithium‑ion batteries following a two-alarm fire downtown that sent one person to hospital.Firefighters were called to a fourth-floor unit of an apartment building on George Street near Dundas Street East just before 6 a.m. on Wednesday.Officials say a lithium-ion battery was involved in the fire, but it’s unclear what the battery was being used for.Paramedics say they assessed a few people at the scene and transported one of them to hospital with non-life-threatening injuries.The fire has since been extinguished.Fires involving lithium‑ion batteries have been a growing concern in the city. Toronto Fire says it has responded to 76 lithium-ion battery incidents so far this year, leading to two fatalities and 14 injuries.Last week, a two‑alarm fire broke out in a unit inside a city‑run shelter operating out of a former hotel in Etobicoke. Firefighters located burned lithium‑ion batteries inside the affected unit.That same week, Toronto Fire said compromised e‑bike batteries contributed to a apartment fire in St. James Town that injured four people, including two children.With files from Lucas Casaletto, CityNews