Investigators announced that reward on Tuesday while releasing a sketch of a suspect who has targeted women in Overbrook.
The most recent attack happened around 12:00 p.m. Monday at 75th Street and Brookhaven Road.
Police say a man armed with a silver kitchen knife with a black handle snatched a woman's purse and her Bible.
The victim was not injured, and police say it was that victim who helped them put together the composite sketch.
Action News first showed you surveillance of one of his attacks back in late January.
"These females have been attacked from behind. The person who has been conducting these attacks has made threats and in some occasions, he has knocked these females to the ground," said Capt. John Przepiorka.
In all, police believe the same man has robbed at least eight women since mid-January.
Everyone in those neighborhoods wanted to get a good look at that sketch so they can be on the lookout.
"Time is short. We will get him," said Mitchell Foxworthy.
"I stopped carrying my pocketbook," said Erica Singleton. "I just don't want to be a target."
The attacks all happened in the area surrounding Cobbs Creek golf course, and police say that's where the suspect runs to get away.
"He is using force. He is producing a knife which fortunately has never been used. We're looking to get this guy off the street as soon as possible," said Captain John Przepiorka.
The man robbed six women in January. 60-year-old Barbara Tucker was attacked in the 7600 block of Brockton Road on January 13th.
"He came in from behind and grabbed me around the neck and whispered in my ear 'If you move, I'll shoot you,'" said Barbara Tucker.
He started back up again in recent days, striking in the 7500 block of Brockton Road last Friday and then Monday in the 7500 block of Brookhaven.
The suspect pounced on the 41-year-old victim in her driveway taking her purse containing credit cards and cash. He even stole her Bible.
"Yeah, that's real low down. One day he's going to wish he had read that Bible," Valerie Foxworth.
In each case, the victims were walking alone both in the early morning and at night.
Police have stepped up patrols, but until he is caught, they want women to take precautions.
"Stay together, stay in pairs," said Captain Przepiorka. "It's very beneficial until we get this man off the streets."
Police arrested a teenager because he had one of the victim's stolen cell phones. He was charged with receiving stolen property, but detectives determined he couldn't have committed a crimes.
Again, there is a $10,000 reward for information leading to his arrest and conviction.
Anyone with information is asked to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (773847) or through PhillyPolice.com.