Tesla Inc will update its battery software after two recent fires involving its Model S electric vehicles (EV) in Shanghai and Hong Kong, the U.S. automaker said on Thursday, adding that investigations into the incidents are ongoing.

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"As we continue our investigation of the root cause, out of an abundance of caution, we are revising charge and thermal management settings on Model S and Model X vehicles via an over-the-air software update that will begin rolling out today, to help further protect the battery and improve battery longevity." Tesla said in a statement on Wednesday.

On Tuesday, Hong Kong`s Apple Daily newspaper reported that a Tesla car caught fire in a shopping mall parking lot 30 minutes after being parked.

Tesla said its investigation with authorities into that incident so far found only a few of the car`s battery modules affected and that the majority of the battery pack was undamaged.

The Hong Kong incident came three weeks after Tesla said it had sent a team to investigate a video on Chinese social media that showed a parked Tesla Model S car exploding in the commercial hub of Shanghai.

There have been at least 14 instances of Tesla cars catching fire since 2013, most of them following a crash.