MINNEAPOLIS, Minn. (AP) -

Nurses are walking picket lines at five Minnesota hospitals in a strike over health insurance, workplace safety, and staffing.

Both sides are braced for a long walkout by the Minnesota Nurses Association, which represents about 4,800 nurses at five Twin Cities-area hospitals run by Allina Health.

The open-ended strike began at 7 a.m. Monday, Labor Day, after a 22-hour bargaining session ended without agreement early Saturday.

Allina says it has brought in around 1,500 temporary nurses, and that it plans to operate the affected hospitals at normal capacity during the strike. Allina CEO Dr. Penny Wheeler says the hospital will continue to deliver high-quality care.

The union's executive director, Rose Roach, says Allina is still seeking too many concession on health insurance without adequately compensating nurses for the higher costs.