(CNN) -- Investigators discovered four more bodies Tuesday at the Cleveland, Ohio, home of a convicted rapist -- making a total of 10 since last week, Police Chief Michael McGrath said Tuesday.



Authorities on Tuesday charged Anthony Sowell with five counts of aggravated murder after unearthing the bodies of women at his home last week, police said.



Sowell, 50, also was charged with rape, felonious assault and kidnapping, police said. His arraignment is scheduled for Wednesday morning.



Police arrested Sowell on Saturday, two days after discovering the decomposing bodies of five females inside his home and another woman's body outside the house.



Earlier Tuesday, a source close to the investigation had told CNN that a seventh body had been found in the home. The source, who was not authorized to speak on the record, did not reveal the gender of the seventh body found at Sowell's home. The source did not say exactly where the body was found at the residence.



Authorities found the first two bodies last week while trying to serve an arrest and search warrant on Sowell related to a sexual assault investigation, and an intensive search began. Sowell was not home at the time; officers found him after a tipster told them of his whereabouts.



The decomposing bodies of the first six women, all of whom were African-American, could have been lying where they were found for "weeks, if not months or years," Cuyahoga County Coroner Frank Miller III told CNN on Saturday.



All six deaths were ruled homicides, Lt. Thomas Stacho of the Cleveland Police Department said Monday, with five of the deaths due to strangulation.



About a month ago, a woman accused Sowell of rape and felonious assault, Stacho noted last week. Investigators obtained the warrants that set off the search after the "cooperation of the victim," he said.



Officers serving the warrants Thursday discovered the badly decomposed remains of two bodies on the third floor of the house, he added. A subsequent search revealed what appeared to be a freshly dug grave under the stairs in the basement. On Friday, investigators returned to the house, dug up the grave and found a third body, Stacho said.



A further search of the house and property found two more bodies in a crawl space and a sixth body in a shallow grave outside the home.



Five different burial methods were used on the victims, and the bodies were in varying states of decomposition, said Miller, which made it difficult to determine the ages of the victims.



Stacho said Sowell makes his living as a "scrapper."



"He walks around and picks up scrap metal and takes it to junk yards to make a few pennies," he said.



Sowell was convicted of a 1989 rape and was imprisoned from 1990 to 2005, Stacho said.



CNN's Karan Olson contributed to this report.
Where were the bodies found? How many bodies have been found? What is he charged with? How many more bodies were unearthed? Who killed them? What is the total number of bodies found? Where are the bodies located at? What total of bodies was there? How long could the bodies have been there for?
Cleveland, Ohio, home of a convicted 10 five counts of aggravated murder four charged Anthony Sowell with five counts of aggravated murder 10 Cleveland, Ohio, 10 "weeks, if not months or years,"
question: Where were the bodies found?, answer: Cleveland, Ohio, home of a convicted | question: How many bodies have been found?, answer: 10 | question: What is he charged with?, answer: five counts of aggravated murder | question: How many more bodies were unearthed?, answer: four | question: Who killed them?, answer: charged Anthony Sowell with five counts of aggravated murder | question: What is the total number of bodies found?, answer: 10 | question: Where are the bodies located at?, answer: Cleveland, Ohio, | question: What total of bodies was there?, answer: 10 | question: How long could the bodies have been there for?, answer: "weeks, if not months or years,"