Fifty-Seven people in Barrie are still banned from their homes as Police continue to investigate a father and son.
Staff Sergent Norman Leach says an evacuation order from Thursday remains in effect.
A number of explosive devices were found at the home of a man, now charged in a cold case.
Investigators are trying to detonate six bombs found inside 54 year-old Donald Feldhoff's house.
Feldoff faces one count of first degree murder in the 1978 death of Michael Traynor.
His father, a 75 year-old is charged with being an accessory after the fact.