Apple has asked customers to stop using certain plug adapters because of a risk of electric shock.
It has issued a recall of two types of plug; , externalthe AC wall plug adapter shipped with Macs and some iOS devices between 2003 and 2010, and a three-pronged plug included in the World Travel Adapter kit.
The affected plugs were shipped in the UK, Singapore and Hong Kong.
Six incidents have been reported, Apple said.
In a statement, the firm said: "In very rare cases, affected Apple three-prong wall plug adapters designed primarily for use in the United Kingdom, Singapore and Hong Kong may break and create a risk of electrical shock if exposed metal parts are touched.
"Customer safety is always Apple's top priority and we have voluntarily decided to exchange affected wall plug adapters with a new adapter, free of charge."
It did not clarify how many people had received electric shocks.