Twenty killed and at least 450 injured in cities across Lebanon a day after exploding pagers killed 12

• Analysis: Pager and walkie-talkie attacks were audacious and carefully planned

A new series of extraordinary explosions aimed at Hezbollah – this time targeting walkie-talkies – has killed at least 20 and wounded more than 450 in cities across Lebanon, as international observers warned that the simultaneous detonation of thousands of booby-trapped communications devices may constitute a war crime.

The targeted detonations of the walkie-talkies came one day after more than 2,800 were injured and 12 killed by exploding pagers in an attack blamed on Israel that world leaders and diplomats have warned could lead to an all-out conflict between Israel and the powerful militant group despite efforts by the US and UN to avert an escalation with Hezbollah.