Nine people have been killed and 2,800 wounded by the blasts, the Lebanese health ministry says.
Nine people, including a child, have been killed after handheld pagers used by members of the armed group Hezbollah to communicate exploded across Lebanon, the country’s health minister says.
Iran’s ambassador to Lebanon was among 2,800 other people who were wounded by the simultaneous blasts in Beirut and several other regions.
Hezbollah, which is backed by Iran, said the pagers belonged “to employees of various Hezbollah units and institutions” and that at least two members were among the dead.
This already happened with phones, but that was a targeted killing:
At 08:00 on 5 January 1996, Ayyash's father called him and Ayyash answered. Overhead, an Israeli plane picked up their conversation and relayed it to an Israeli command post. When it was confirmed that it was Ayyash on the phone, Shin Bet remotely detonated it, killing him instantly.[3]
Well, I'm guessing they concealed them in an extra-large Li-Ion battery and wired a heating element in series inside it, so that shorting the terminals by the circuitry triggered the explosive. Pagers use so little power that the lower capacity would be hard to notice and the heating element's voltage drop would be negligible. I assume the pagers' command & control equipment had backdoors, too.