11.31pm BST

We're going to wrap up the live blog. Here's a summary of where things stand:

• Basic details of the attack on a US diplomatic outpost in Benghazi, Libya, remain unknown. US officials said they don't know how Ambassador Chris Stevens died. It is unclear who carried out the attack, and whether it was planned beforehand, as the White House suspects.

• President Obama paid tribute to Ambassador Chris Stevens, Sean Smith and two other Americans killed in Benghazi in a meeting with State Department staff.

• The film said to have incited the anti-US violence appears to have been made without the full cooperation of its actors, one of whom told Gawker she was shocked to learn she had performed in a spoof of Islam. The film was originally not about the Prophet Mohammed but about someone called Master George, she said. The identity of the filmmaker is still unknown.

• The outpost in Benghazi was unguarded by Marines, as all full US embassies are. The Benghazi post was an interim facility with lesser security. Fifty members of an elite Marine guard were deployed to Benghazi Wednesday.

• Mitt Romney drew fire for attacking the White House response to the crisis in Cairo before news had emerged of Stevens' death in Libya. President Obama said Romney "seems to have a tendency to shoot first and aim later."

• Libyans staged rallies in Tripoli and Benghazi to condemn the attacks on the US outpost. Libya elected its first post-Gaddafi prime minister, Mustafa Abushagur.