Samsung has promised to give an official response within three to seven days after investigating the suspected explosion of a Chinese consumer’s Galaxy Note 7 phone, making a final decision about whether a recall of the batch of phones is necessary.

This is the first reported explosion of a Galaxy Note 7 in China. The South Korean phone maker has so far recalled 2.5 million handsets in 10 countries, including Australia, South Korea and the U.S., all due to battery fires.

Samsung has said that the company used a battery made by another supplier for the Galaxy Note 7s sold in China, which means they shouldn’t carry the same risks as other Galaxy Note 7s in different parts of the world.

On Sept. 18, Internet user “Jiwawani” published a post in an online forum claiming that his Galaxy Note 7 had exploded mid-use. The user wrote, “I was sitting on my bed playing with it when suddenly the screen blacked out and cell phone began to shake. I put it away immediately, and later it exploded.”

“Jiwawani” also uploaded photos of the phone, which showed apparent signs of burns and bulging parts from the alleged explosion. The phone’s back cover had partially melted.

Internet user “Jone_yao,” who claimed to be the first poster’s friend as well as another Galaxy Note 7 user, revealed on his Weibo account that the phone “exploded during common usage and was not in the process of charging.” He upload a photo that showed the SM-N9300 model in blue coral, in addition to the phone’s IMEI number, which confirms that it was sold in the Chinese mainland. “Jone_yao” also said he ordered the phone on Chinese online marketplace JD.com on Aug. 26. He claimed to have paid for the phone on Sept. 1, after which it was shipped to him on Sept. 2. JD.com later confirmed this information.

Samsung previously announced a recall of 1,858 units of its Galaxy Note 7 handsets in China at the demand of China's quality watchdog, the General Administration of Quality Supervision, Inspection and Quarantine, after the product was found to have fire-prone batteries.