Lebanon's Hezbollah was still handing its members new Gold Apollo branded pagers hours before thousands blew up this week, two security sources said, indicating the group was confident the devices were safe despite an ongoing sweep of electronic kit to identify threats.

At least 12 people were killed and over 2,800 people were injured Tuesday in Lebanon when electronic pagers used by many members of Hezbollah — who had switched to the older technology over concerns of mobile phones’ vulnerability to security breaches — exploded simultaneously across the country in a coordinated attack on the group.

Dozens were killed and hundreds injured. This is the image of Israel's probable revenge on Hezbollah fighters. Not only pagers but also other electronics were exploding. We asked experts what they think of this form of attack.