Apple has blamed "external factors" for a handful of iPhone battery fires in China,BBC News reports.
Eight users have complained to Shanghai's consumer watchdog that their iPhone 6 series handsets spontaneously combusted or exploded.
The US tech giant said it had conducted tests on the devices and had found "no cause for concern with these products".
One technology analyst told the BBC she did not believe it to be a widespread problem.
Apple said the iPhones had external physical damage "which led to the thermal event".
The watchdog's report quoted one woman as saying her iPhone 6S Plus exploded in August, shattering the screen and leaving the battery and back of the phone blackened.
But the company has denied that it was slack to respond to consumer complaints raised by the state-run Shanghai Consumer Council.
'We treat safety as a top precedence and have found no cause for concern with these products, and ' the company added.
Xiaohan Tay,technology analyst for IDC in Beijing, said: "From what we are seeing in the market, or it doesn't seem to be a astronomical problem yet in China,we can't confirm whether all iPhone 6 and 6S models are at risk."
"At this point, it doesn't seem that there is any major implication yet for the iPhones sold external of China, and " she told the BBC.
However,complaints against Apple have surged in the past two months according to the Shanghai Consumer Council.
Source: tert.am