Hezbollah’s leaders have pressured the Lebanese government to end its cooperation with U.N. investigators and have threatened consequences if it doesn’t. Walid Jumblatt, the Lebanese Druze leader, said naming Hezbollah in the indictments would be enough to trigger a civil war like the one from 1975 to 1990…

Lebanon’s prime minister, Hariri’s 40-year-old son, Saad Hariri, now faces the painful choice of whether to continue to try to find out who killed his father or to acquiesce to Hezbollah in order to maintain Lebanese unity and stability, many observers said.

“He is in a tough spot,” said a person close to Hariri, speaking on the condition of anonymity because of the issue’s sensitivity. “But he is still committed to the tribunal. He doesn’t believe Hezbollah will be able to stop it. . . . He will not allow a civil war.”