UNDATED (CNN) -- One person in under arrest in connection to the attack that killed U.S. Ambassador to Libya Christopher Stevens. Libya's prime minister said authorities are still looking for 3 or 4 more people.
We still don't know what role the suspects allegedly played in the killing. This news comes as a Youtube film clip mocking Islam sparks more anti-American violence across the Middle East. Now the U.S. is tightening security at embassies worldwide.
The anger directed towards America spread across borders and closer to U.S. embassy walls Thursday. Demonstrators in Yemen tried to break through the embassy gate, police fired warning shots and tear gas in Egypt, and Iranians shouted "death to America" outside of the Swiss embassy in Tehran since there are no official diplomatic relations with Washington.
It is anti-American fury fueled by a 14-minute anti-Islamic film clip on YouTube that the American government denounces. Secretary of State Hillary Clinton says, "Let me state very clearly and I hope it is obvious that the United States government had absolutely nothing to do with this video. We absolutely reject its content and message."
Clinton rejected the video, but called upon governments to stop the violence resulting from it. She says, "Any responsible leader should be standing up now and drawing that line."
Secretary of State Clinton's words came less than a day after U.S. ambassador to Libya Chris Stevens and three others were killed by the violence. President Obama says, "No act of violence shakes the resolve of the United States of America."
The U.S. is sending two warships toward Libya in case they're needed, as the government tries to figure out if the attack was planned. U.S. intelligence officials believe it is very unlikely it was core Al Qaeda behind the attack.
There are some in Libya showing support for the slain ambassador. But these signs of peace could be overshadowed by violence from crowds who believe a video speaks not just for itself, but for a country.
Meanwhile, there are more mysteries about the film that's prompted this violence.
It appears the filmmaker behind it may have used a false name, and the cast and crew members say in a statement