At least eight people tied to Hezbollah were killed and more than 2,800 injured, many of them critically, Tuesday after their pagers exploded across Lebanon in an operation being blamed on Israel, according to Lebanon’s health minister.

Reuters reported earlier on Tuesday, citing an unnamed security source, that the hundreds of wounded Hezbollah members included both fighters and medics. An anonymous Hezbollah official told the outlet that the pager explosions were the “biggest security breach” in its nearly year-long battle with Israel.