Fresh protests are taking place around the Muslim world over amateur anti-Islam video Innocence of Muslims, which was produced in the US.
At least one protester was killed in violent protests in Pakistan and thousands attended an angry rally in the Philippines city of Marawi.
Weapons were fired and police cars torched in the Afghan capital, Kabul.
The leader of Lebanon’s Hezbollah has said the US faces “very dangerous” repercussions if it allows the full video to be released.
In a rare public appearance, Sheikh Hassan Nasrallah told a rally in the capital Beirut that the world did not understand the “breadth of the humiliation” caused by the “worst attack ever on Islam”.
Thousands of people were on the streets, waving flags and chanting: “America, hear us – don’t insult our Prophet”.
Sheikh Hassan Nasrallah, the influential leader of the Shia Muslim militant group, earlier called for a week of protests – not only against American embassies, but also to press Muslim governments to express their own anger to the US.
A trailer for the obscure, poorly made film at the centre of the row, entitled Innocence of Muslims, came to light in recent weeks and protests first erupted in the Egyptian capital, Cairo, last Tuesday.
More than a dozen people have died in protests since.
In Pakistan’s Khyber Pakhtunkhwa province, the local press club was burnt down and government offices attacked in the Upper Dir district.
One protester was killed in an exchange of fire with police, following the death of another protester on Sunday.
A protest of thousands of students took place in the nearby city of Peshawar, reported AFP news agency.
In the biggest city, Karachi, police fired in the air to disperse a crowd heading for the US consulate, reported Reuters, and lawyers marched in Lahore.
At least one protester was killed in violent protests in Pakistan over anti-Islam video Innocence of Muslims
Former British Prime Minister Tony Blair said the film was “wrong and offensive but also laughable as a piece of film-making – what is dangerous and wrong is the reaction to it”.
Tony Blair, who now serves as a Middle East peace envoy, said the protests were ultimately about the “struggle of modernization” under way in the region and not “some form of oppression by the West”.
The exact origins of the film are shrouded in mystery, although US authorities say they believe the film was made by Nakoula Basseley Nakoula, a convicted fraudster living in California who has since been questioned over his role.
A trailer of the film is available on YouTube and the company said it would not remove it as it was within its guidelines.
But a spokesperson said YouTube had restricted access to the clip in countries where its content is illegal “such as India and Indonesia as well as in Libya and Egypt given the very sensitive situations in these two countries”.
The eruption of anger has seen attacks on US consulates, embassies and business interests across the Middle East and North Africa. British, Swiss, German and Dutch properties have also been targeted.
The US ambassador to Libya was among four Americans killed on the day protests first broke out.
Libyan Interior Minister Fawzi Abdul Al has dismissed a claim on Sunday by the president of the national congress that 50 people have been arrested in connection with the deaths.
He said only four people had been detained so far, although up to 50 could be under investigation.
• About 3,000 protesters burned US and Israeli flags in the southern Philippines city of Marawi
• In Yemen, hundreds of students in the capital, Sanaa, called for the expulsion of the US ambassador, said AFP
• In Indonesia’s capital, Jakarta, hundreds of protesters faced off with police, throwing stones and petrol bombs, while police retaliated with tear gas
• More protests were reported in Srinagar, Indian-administered Kashmir
• Hundreds of Palestinians staged a peaceful sit-in protest in the West Bank city of Ramallah
• Angry demonstrators in the Afghan capital, Kabul, fired guns, torched police cars and shouted anti-US slogans
• A small protest was held outside the US embassy in Azerbaijan’s capital, Baku, AP reported.
Libya has made several arrests in connection with the attack on the US consulate in Benghazi in which Ambassador Christopher Stevens was killed.
New Libyan Prime Minister Mustafa Abu Shaqur said the investigation was making progress.
The attack happened on Tuesday during protests over a US-made film that mocks the Prophet Mohammed.
Similar protests have spread across the Middle East and North Africa. Further unrest is expected at Friday prayers.
Clashes between riot police and protesters continued overnight in the Egyptian capital Cairo, where Islamist groups and others have called for a peaceful “million-man march” later on Friday.
US President Barack Obama has promised to do whatever is necessary to protect US citizens abroad and said he was urging foreign governments to guarantee their security.
A White House statement said he had thanked Yemeni President Abd-Rabbu Mansour Hadi for condemning an attack on the US embassy there and for launching an investigation.
“President Obama expressed appreciation for the co-operation we have received from the Yemeni government and underscored the importance of working together to ensure the security of US personnel,” the statement said.
Libya has made several arrests in connection with the attack on the US consulate in Benghazi
In Benghazi, US and Libyan officials are investigating the possibility that heavily armed militants used the protest as a pretext for a co-ordinated assault.
Libyan officials say those arrested are being interrogated on suspicion of having instigated the attack.
Four embassy staff died, including Ambassador Christopher Stevens.
PM Mustafa Abu Shaqur blamed the attack on “criminals” and said anger against the film could not justify it.
“The people, they don’t understand that such a case like this, the American government has nothing to do with it,” he said.
“Somebody made a film and they put it on YouTube. It was very offensive for sure but that doesn’t justify taking this wild actions against Americans or American embassies. People can come out and demonstrate and express their opinion peacefully.”
Following the attack, some Libyans have taken part in rallies in Benghazi and Tripoli denouncing the violence.
Libyan Deputy Interior Minister Wanis al-Sharif told reporters that those arrested had been taken from their homes on Thursday but gave no further details.
No group has said it carried out the attack and Wanis al-Sharif said it was too early to say if those arrested belonged to a particular organization.
Meanwhile, further protests against the US-made film are expected on Friday.
In Yemen, demonstrators briefly stormed the grounds of the US embassy in Sanaa on Thursday and burnt the US flag before being driven back by security forces.
A White House spokesman said all those working in the embassy were safe and accounted for.
In Egypt, 224 people were injured in protests outside the US embassy in Cairo on Thursday, with some demonstrators demanding the expulsion of the ambassador. Police vehicles were set alight.
Egyptian media said that as night fell on Thursday, police were continuing to fire tear gas at stone-throwing protesters.
Calls for a million-man march in Cairo came from The Muslim Brotherhood, the Salafist al-Nour party and non-religious groups including the “Ultra” fans of Zamalek football club.
They said they had invited Muslims, Coptic Christians and all Egyptian citizens to join them.
President Mohammed Mursi said Egyptians rejected “any kind of assault or insult” against the Prophet Muhammad, but appealed for calm.
Small protests have also been reported in Bangladesh, Iraq, Morocco, Sudan and Tunisia, and security has been increased at US embassies and consulates around the world.
US Secretary of State Hillary Clinton has condemned the film, entitled Innocence of Muslims, as “disgusting” and “reprehensible” but said it was no excuse for violence.
The film was shot in the US and posted online earlier this year. It depicts the Prophet Muhammad as a womanizer and the bloodthirsty leader of a ragtag group of men who enjoy killing.
However, the film’s exact origin and the motivation behind its production remain a mystery.
Some of the actors involved have since condemned the film, saying they had no idea it was to be used as anti-Islam propaganda.