About 1.5 million bottles of iced tea have been recalled by Sweet Leaf Tea after glass was found in the product.

Four customers said they found glass fragments in bottles of the tea. The first complaint was received in July, and three others more recently. No one was injured, according to a statement from the company, NBC News reported.

The recall covers 16-ounce bottles of flavored iced tea produced between Feb. 27, 2015 and Dec. 6, 2015.

Sweet Leaf said the glass got into the tea as a "result of glass breakage during the filling process," and that the problem has been corrected, NBC News reported.