Samsung this morning issued a global recall for its Galaxy Note 7 smartphone, saying that it found a “battery cell issue” after investigating reports of some devices exploding or burning while charging.

The recall is a setback for the consumer electronics giant the week before rival Apple is expected to unveil its newest iPhone version.

“To date (as of September 1) there have been 35 cases that have been reported globally and we are currently conducting a thorough inspection with our suppliers to identify possible affected batteries in the market,” the company says in a statement. “However, because our customers’ safety is an absolute priority at Samsung, we have stopped sales of the Galaxy Note7.”

The company says it will voluntarily replace any Note 7 devices already being used by consumers. It’s also expected to recall unsold devices. About 1 million of the devices have been sold, out of the 2.5 million produced, according to NPR News.

Details on the replacement process haven’t yet been released. “We acknowledge the inconvenience this may cause in the market but this is to ensure that Samsung continues to deliver the highest quality products to our customers,” Samsung says. “We are working closely with our partners to ensure the replacement experience is as convenient and efficient as possible.”

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