Borders Group said two top executives left the struggling bookseller over the weekend, stoking worries about the company’s financial condition.

The Minneapolis-based retailer said in a securities filing that executive vice president and general counsel Thomas D. Carney resigned Sunday, followed by Chief Information Officer D. Scott Laverty yesterday.

On Friday, Borders shares dropped 13 percent after the company said it’s delaying payments to publishers while it attempts to refinance its debt. Borders added that it couldn’t guarantee that its refinancing efforts would be successful.

Already a few publishers have begun to halt shipments to Borders, while key distributors continue to support the chain, according to reports.

Separately yesterday, No. 1 book retailer Barnes & Noble said its December sales at stores open at least a year surged 9.7 percent, fueled by strong demand for the company’s Nook reading device.