Apple is investigating the death of a Chinese woman who received a massive shock after answering a call on her charging iPhone 5, reports Reuters.

Last Thursday, Ma Ailun, a 23-year-old woman from China's western Xinjiang region and a flight attendant with China Southern Airlines, was electrocuted when she took a call on the charging mobile telephone, the official Xinhua news agency quoted police as saying on Sunday.

"We are deeply saddened to learn of this tragic incident and offer our condolences to the Ma family. We will fully investigate and cooperate with authorities in this matter," Apple said in an e-mail.

Ma's sister warned others to be careful on Sin'a microblog. It's unclear if the woman was using a third party charger or cable at the time of the incident.