CAIRO — After days of anti-American turmoil in the Muslim world, governments on Sunday looked ahead to a week of trying to make an uneasy accommodation between the anger of their citizens and their desire to convince the United States of their goodwill.

But U.S. diplomatic outposts remained under threat. In Pakistan, at least one protester was killed and 18 were injured Sunday as hundreds of people broke through a barricade in a march to the U.S. Consulate in Karachi, and thousands more rallied in Lahore, where American flags were burned, the Associated Press reported.

In Cairo, the U.S. Embassy returned to full staffing Sunday, a spokesman said, for the first time since Tuesday protests against an anti-Islam video made in the United States sparked turmoil across the Muslim world. But the American diplomatic presence remained reduced elsewhere in the region, meaning that there were fewer routes to repair relations even as they came under the most strain since the wave of democratic change caused last year by the Arab Spring.

In Tunisia, where additional security has been deployed to protect the embassy, the Saturday decision to withdraw nonessential U.S. staff from the mission there appeared to jar Tunisian officials, who have marketed the country as a model of democratic transformation after the peaceful toppling last year of the longtime president, Zine El Abidine Ben Ali. Tunisia’s 2011 protests set the rest of the Arab world afire — and led, in the end, to newfound freedoms for many citizens to express their distaste for their own governments and for the United States.

Leaders have struggled ever since to accommodate those anti-American sentiments.

In an address to the nation Friday night, Tunisian President Moncef Marzouki condemned that day’s violent attack on the U.S. Embassy and an American school, in which four protesters were killed. He said those who organized the protest — widely described here as religious hard-liners known as Salafists — had “crossed a red line.” Yet he also sought to appease the sentiments of those reportedly angered by the video, “The Innocence of Muslims,” saying Tunisia would work with Egypt to sue its producers.

Hedi Ben Abbas, a foreign affairs minister of state whose portfolio includes the Americas, said in an interview Sunday that the Tunisian government “deeply regrets” the American decision to pull its diplomats following the attack, which he insisted was triggered by religious fervor, not anti-American anger.

Security officials, Ben Abbas said, were overhauling their procedures and could now “guarantee” the safety of all diplomatic facilities and foreigners. He said the government, which is headed by a moderate Islamist party that has faced criticism for tolerating religious zealotry, is determined to respond more firmly than it has to previous violent protests staged by Salafists. Dozens of people suspected of involvement in the riot have been arrested, according to local news reports.

Friday’s demonstration, Ben Abbas said, “was for us the end of the game.”