Hezbollah did not immediately confirm the death of Ibrahim Aqeel. The United States had accused him of being involved in bombings that killed more than 200 U.S. Marines and many others in Beirut in 1983.

CAIRO — This week saw a dizzying escalation in the 11-month-old conflict between Israel and Lebanon’s Hezbollah. First came two days of exploding pagers and walkie-talkies used by Hezbollah — deadly attacks pinned on Israel that also maimed civilians around Lebanon.

Israel killed a top Hezbollah commander and other senior figures in the Lebanese movement in an airstrike on Beirut on Friday, vowing to press on with a new military campaign until it is able to secure the area around the Lebanese border.