Citing American and other officials briefed on the operation, the New York Times reported Tuesday that Israel hid explosives inside a batch of pagers ordered from Taiwanese manufacturer Gold Apollo and destined for Hezbollah. A switch was embedded to detonate them remotely, it added.

Is there a law that covers indiscriminate killing?

The United Nations Convention on Certain Conventional Weapons (CCW or CCWC), concluded at Geneva on October 10, 1980, and entered into force in December 1983, seeks to prohibit or restrict the use of certain conventional weapons which are considered excessively injurious or whose effects are indiscriminate.

Yup, looks like a war crime to me.

Edit: On further thinking, do they know that none of the modified pagers made it into other markets? They likely changed hands more than once between installing the explosives and distributing them to Hezbollah members allowing for inventory 'shrinkage.' I'll bet this is going to end up like Project Eldest Son were exploding pagers show up for ages after they were meant to be set off.

Maybe, though if they’re not getting punished for the whole, y’know, genocide thing, I think they’re not going to get punished over weaponized pagers either.

If it's Israel ... no

If it's any other country .... yes