AURORA - A Planned Parenthood health center opened its doors to patients Tuesday, two weeks later than planned, after anti-abortion activists raised questions about how it received its building permits.

About 100 protesters - some holding red roses, others rosaries and some with signs reading "Planned Parenthood: Bad for Aurora'' - gathered peacefully on sidewalks near the clinic, which became a focus of the national abortion debate during the review.

Planned Parenthood was granted an occupancy permit for the clinic Monday afternoon.

"We have no regrets about how we went about this process,'' Steve Trombley, president and CEO of Planned Parenthood/Chicago Area, said Tuesday. "We kept it private from our opponents, and we did it for good reason.''

Trombley said some walk-up patients were expected to drop by the clinic Tuesday afternoon, and appointments were scheduled for later this week.

Mayor Tom Weisner said, while Planned Parenthood was "less than forthcoming'' when it used a subsidiary called Gemini Office Development to build the clinic, three attorney reviews found no legal basis to deny an occupancy permit to the clinic.

It became public knowledge in late July that Planned Parenthood would occupy the space.

The original opening date of Sept. 18 was delayed because city officials would not grant an occupancy permit while the review was under way.

Anti-abortion protesters have accused Planned Parenthood of deceiving officials in Illinois' second-largest city into granting building permits.

Planned Parenthood officials said they were trying to protect the clinic's staff and construction workers from protests but there was no effort to defraud city officials.