Pagers, used every day by health care professionals, became a deadly weapon Tuesday as thousands of them simultaneously exploded in Lebanon.

Lebanese officials say more handheld devices exploded a day after thousands of pagers carried by Hezbollah members blew up in an attack blamed on Israel.

The significance of the attack quickly became clear: The pagers were being used by members of Hezbollah, the Lebanese militant movement that has been fighting an undeclared war with Israel since October.