Almost a week after construction crews demolishing the former Rainbo Roller Center found human bones in the rink's basement, Chicago police on Tuesday discovered more bones at the North Side site.

Construction workers used a backhoe to dig large holes on the south side of the nearly demolished building in the 4800 block of North Clark Street, "in the same area" where the bones were found last Wednesday, according to authorities.

Aided by a cadaver-sniffing dog, police and workers dug and sifted most of the day, filling at least six paper bags with what appeared to be bones and bone fragments.

At one point, an officer held up a long bone with decayed cloth attached to it before placing it in a brown paper bag. Police also found two different sneakers several feet under the ground and placed those in bags as well.

The bones found last week were determined to be human, a medical examiner spokesman said Tuesday. But police do not know if the bones found Tuesday belong to the same body as those found last week, said police spokesman Sgt. Edward Alonzo.

"They're not sure if they're from the same or from another," he said.

The bones were sent to the medical examiner's office, he said.

The rink was closed in March and the lot leveled to make way for a proposed condominium and townhouse development.

The lot is also across the street from the St. Boniface Catholic Cemetery, prompting one passerby to comment on the possible origin of the bones.

"Maybe somebody didn't like who they were lying next to," said Jose Delangel.