Nokia has suspended sales of its Lumia 2520 tablet in some European countries while it fixes a fault with charger units which it said on Thursday could pose a risk of causing an electric shock. Nokia said there was a risk that the plastic cover of certain AC-300 charger units manufactured by a third party could come loose and separate, exposing certain internal components that could cause an electric shock if touched when the plug remains in a socket. Nokia said there have been no confirmed consumer incidents due to their use. The Lumia 2520 tablet was among the last products Nokia developed before deciding to sell its phone and devices unit to Microsoft in a deal that is due to close in April.