NEW YORK — Weighed down by the integration of the former Saks Inc.’s Northern Department Store Group, The Bon-Ton Stores Inc. widened its first-quarter loss.

The net loss for the quarter ended April 29 was $10.8 million, or 66 cents a share, which compares with a net loss of $4.4 million, or 27 cents a share, in the prior year. Sales for the quarter jumped to $561.8 million from $262.5 million in the same period last year. The reported loss was greater than Wall Street’s estimate of 42 cents.

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