London police along with the fire department and the Ontario Fire Marhsal's office are investigating three separate fires over the weekend.
A 57-year-old man and 40-year-old woman had to be rescued from an apartment fire at 214 Egerton Street Friday night.
The pair remain in critical condition.
Later Friday evening, there was another blaze at a residence in the area of Margaret Street and Ethel Street.
One person was taken to hospital with minor injuries.
Saturday morning, emergency crews were called to 257 Merlin Crescent around 9 a.m. for a blaze in an apartment above a variety store.
No one was hurt but damage was extensive.
A London police cruiser continued to guard the scene Saturday afternoon.
Police say the three fires are not related.
