Also on Friday, two Israeli Apache attack helicopters crashed in northern Israel after colliding in midair, the Israel Defense Forces said. The pilot was killed and three others on board the copters were injured.

In a Thursday interview with Arabic-language news network Al-Jazeera, Nasrallah accepted responsibility for the Wednesday attack, while conceding that an apology to the family was not sufficient.

On Thursday about 2,250 Americans left Lebanon, and another 3,000 are expected to depart Friday, State Department officials said.