BlackBerry shows off BBM video chat and screen share

The first two handsets powered by the new BlackBerry 10 operating system have been unveiled.

The Z10 is controlled via a 4.2in (10.7cm) touchscreen while the Q10 has a smaller 3.1in (7.9cm) screen and physical keyboard.

The UK will be the first to get the Z10 where it will launch on Thursday.

The BBM messaging app can now make audio and video calls as well as being able to share each others screens in the conversation.

Blackberry chief executive Thorsten Heins appeared alongside head of software Vivek Bhardwaj, who demonstrated the new feature at a launch event in the US.