SEOUL, South Korea — Samsung Electronics recalled all of its Galaxy Note 7 smartphones on Friday after finding batteries of some of the flagship gadgets exploded or caught fire.

Samsung’s Note 7s are being pulled from shelves in 10 countries, including South Korea and the United States, just two weeks after the product’s launch. Customers who already bought Note 7s will be able to swap them for new smartphones in about two weeks, said Koh Dong-jin, president of Samsung’s mobile business.

He apologized for causing inconvenience and concern to customers.

The recall, the first for the new smartphone, comes at a crucial moment in Samsung’s mobile business. Apple is scheduled to announce its new iPhone next week and Samsung’s mobile division was counting on momentum from the Note 7’s strong reviews and higher-than-expected demand.

Samsung said it had confirmed 35 instances of Note 7s catching fire or exploding. There have been no reports of injuries .