Fresh protests are under way in Muslim countries against an anti-Islam film made in the US.
In Pakistan, a government-declared "special day of love" for the Prophet Muhammad has seen violent clashes and at least one death in the northern city of Peshawar, and clashes elsewhere.
The US has paid for adverts on Pakistani TV that show President Barack Obama condemning the film.
There has been widespread unrest over the amateur film, Innocence of Muslims.
The protests have already claimed several lives around the world.
Although the US has borne the brunt of protests, anti-Western sentiment has been stoked further by caricatures of the Prophet Muhammad published in a satirical French magazine.
In Peshawar, protesters attacked and ransacked two cinema buildings. A driver for a Pakistani TV station was killed when police opened fire to disperse protesters, seven of whom were reported wounded.
Clashes between police and protesters are also being reported from the cities of Rawalpindi, Lahore and Karachi.
In the capital Islamabad, which saw fierce clashes between protesters and security forces on Thursday, the BBC's Aleem Maqbool says security forces have attempted to seal off large parts of the city to demonstrations - but that protesters on foot and motocycles have breached a blockade after setting a checkpost alight.
Dozens of protests against the film had already been held across Pakistan over the past week - killing at least two people - but Thursday was the first time violence had erupted in the capital.
All major political parties and religious organisations have announced protests for Friday, along with trade and transport groups.
The Pakistani authorities have urged people to demonstrate peacefully, with mobile phone services cut across the country to reduce security risks.