Apple's larger iPhone 6 may have been glimpsed in what are claimed to be "internal mockups" of the device, Digital Spy reported.

The next-generation handset is rumoured to be coming in both 4.7-inch and 5.5-inch size options, but only the smaller version has appeared in previous leaks.

Serial leaker Sonny Dickson has now posted images depicting alleged dummy models of both devices alongside one another.

Dickson, who leaked the iPhone 5S ahead of launch, claims that the handsets are not working models, but prototypes created by Apple for testing purposes.

A purported photograph of the iPhone 6 was recently leaked online by Taiwanese popstar Jimmy Lin, who revealed the iPhone 5C ahead of its debut.

The iPhone 6 is expected to be announced alongside the much-rumoured iWatch in the autumn.