– NEW: 3 or 4 others are being sought, prime minister says
– U.S. warships with guided missiles are moving toward the Libyan coast, officials say
– Libya's prime minister denounces the "cowardly criminal act" in Benghazi
– Analyst: "Jihadists will want the world to believe that the attack is just a part of the protests"

(CNN) – At least one person has been arrested in the killing Tuesday of U.S. Ambassador to Libya Christopher Stevens and three other Americans, the Libyan prime minister said Thursday.

"Three or four are currently being pursued," Mustafa Abushagur told Christiane Amanpour, anchor of on CNN International's "Amanpour." and ABC's Global Affairs Anchor. He said the arrest was made early in the day in Benghazi and that the person arrested and those being sought are all Libyans.

Earlier, the Libyan state-run news agency LANA said more than one person had been arrested. It cited the deputy minister of interior in the eastern region, Wanees al-Sharif, as its source. FULL POST

A panel discusses the anti-Muslim film that has contributed to protests in the Middle East.

Imam Feisal Abdul Rauf, founder and CEO of the Cordoba Initiative says, “The Quran states explicitly that no soul shall be responsible for the sins or the crimes of another. And while this film is indeed offensive, and those who have done this have done this deliberately to offend Muslims, we should not kill innocent people."

James Rubin, former assistant secretary of state under president Clinton – and Amanpour’s husband – said of the U.S., “We are a country where the word ‘tolerance’ is built deeply into our system, and we have to make that true both through law enforcement, through education.”

Rubin added, “We can defend somebody’s right to speak but that doesn’t mean we can’t condemn what they say. And we have to be very clear on that. And we can’t let the Arab Spring be hijacked by the extremists and remember that it’s a good news story – a positive development for the people of the Middle East.”