California police seek neighbors' help in murder of 8-year-old Leila Fowler

California sheriff's officials say investigators were knocking on the doors of hundreds of homes as they try to find possible witnesses in their search for the killer of 8-year-old Leila Fowler.

A sheriff's spokesman says investigators were canvassing homes in the Valley Springs and Rancho Calaveras area Saturday in the hopes of locating new witnesses or refreshing the memories of other residents who may have seen something.

Sgt. Chris Hewitt of the Calaveras County Sheriff's Office says investigators expect to find more people at their homes on the weekend to answer questions.

Leila was found stabbed in her family home last Saturday. Her 12-year-old brother described his sister's killer as being tall with long gray hair, but officials say a witness who said she also saw the man flee has since recanted and is no longer credible.

Investigators searching for evidence in the case were looking at several knives Friday to determine if one could have inflicted the fatal wounds.

Hewitt would not say from where investigators had recovered the knives, but said that the information eventually would come out.

 "We don't want to put too many details out there that could taint our interviews," Hewitt said.

He declined to say whether they were confiscated from the rural home victim Leila Fowler shared with her father, stepmother, 12-year-old stepbrother and two older siblings. Family members are being question at this point only as witnesses, he said.

The Associated Press contributed to this report.