Scores of anti-Islamist demonstrators gathered last week in downtown Benghazi, Libya, to protest a proposed unity government.

Five mortar shells fell nearby, presumably fired by Islamist militants who, for their own reasons, also opposed the unity government. No one was hurt and instead of dispersing, participants said, the crowd only grew larger.

Navigating a war zone is no longer anything new for the hundreds of thousands of residents remaining in Benghazi. More than four years after an uprising there led to the ouster of Col. Muammar el-Qaddafi, the battle for the city may now be the most intractable obstacle to resolution of the broader conflicts splintering Libya. […]