Officers were called at 6-50am on Wednesday morning (March 1st) by the 34-year-old woman to say she had been seriously assaulted at an address on Comrie Cescent in the town.
She had suffered serious facial and neck injuries.
A Lancashire Police spokesman said: "At shortly before 6am on Thursday, March 2nd, we were contacted about another incident which happened overnight at an address on Smith Street.
"On arrival, officers found a 27-year-old man in the kitchen with serious facial injuries and possible knife wounds. A woman (48), had also been attacked. The victims remain in hospital where they are recovering from their injuries."
Detectives are continuing their appeal for anyone with information, in particular anyone who saw anything suspicious in the Comrie Crescent area between 2pm on Tuesday (February 28th) and 6-30am on Wednesday (March 1st).
In relation to the further incidents, officers are also appealing for any witnesses around the Coal Clough Lane, Trafalgar Street or Smith Street areas from around midnight to 7am on Thursday (March 2nd).
Anyone with information should contact police on 101 quoting logs 166 of March 1st or 0137 of March 2nd or the independent charity Crimestoppers on 0800 555 111.