The latest sexual assault happened about 5:00 p.m. along the 800 block of Peach Tree Road.
The suspect entered through an unlocked door, attacked the woman in her bedroom at knifepoint then bound and assaulted her.
Just 20 minutes after the assault, a pizza delivery man was robbed a block from the scene of the sexual assault - the 700 block of Peach Tree Road.
The two victims of last night's crimes gave vague but similar descriptions of their attacker.
Only Action News there as New Castle County detectives searched the creek along the Greentree Apartments. They pulled out a shirt and other potential evidence. A K-9 unit canvassed the creek bed as a chopper hovered above.
So far, police have not made any arrests.
Last Thursday morning, a man forced a 36-year-old woman into a bathroom inside the old Darley Road Elementary School, in the 500 block of Darley Road.
He then raped her.
Police say the attacker had been inside the building earlier in the day, asking questions about daycare service.
The school is being converted into a Boys and Girls Club.
Delaware State Police are investigating last week's rape.
New Castle County Police are looking for the suspect or suspects involved in Tuesday night's crimes.
If you have information on any of the crimes, investigators urge you to call them.