More than a dozen charges are expected to be laid against CFB Petawawa Corporal Derrick Gallagher tomorrow, according to sources.
The 31-year-old was charged with eight counts of sexual assault earlier this month, and Police are pleading for any women who have been in contact with Gallagher in the last seven years to come forward.
OPP say there may be dozens of possible victims in Ottawa, the Upper Ottawa Valley, other parts of Ontario and Quebec.
They add it's possible that women may have been drugged or may have contracted a sexually transmitted disease.
With files from CTV Ottawa