A Pakistani minister has offered $100,000 (€77,000) to anyone who kills the maker of an online video which insults Islam, as sporadic protests rumbled on across parts of the Muslim world.

"I announce today that this blasphemer, this sinner who has spoken nonsense about the holy Prophet, anyone who murders him, I will reward him with $100,000." Railway Minister Ghulam Ahmad Bilour told a news conference, to applause.

"I invite the Taliban brothers and the al-Qaeda brothers to join me in this blessed mission."

A spokesman for Pakistan's prime minister said the government disassociated itself from the minister's statement.

People involved in the film, an amateurish 13-minute clip of which was posted on YouTube, have said it was made by a 55-year-old California man, Nakoula Basseley Nakoula.

Mr Nakoula has not returned to his home in the Los Angeles suburb of Cerritos since leaving voluntarily to be interviewed by federal authorities.

His family has since gone into hiding.

Protests spread to the Bangladeshi capital Dhaka yesterday, as thousands of Islamist activists clashed with police who used batons and teargas to clear the protest.

In Kano, northern Nigeria's biggest city, Shia Muslims burned American flags, but their protest passed off peacefully.

German Foreign Minister Guido Westerwelle called on Muslim countries to protect foreign embassies.

"The governments in host countries have the unconditional obligation to protect foreign missions. If that doesn't happen, we will emphatically criticise that and if it still doesn't happen it won't go without consequences," he said.

Germany's embassy in Sudan was stormed earlier this month as was the US mission in the capital Khartoum.

In the Libyan city of Benghazi, a crowd forced out an Islamist militia some US officials blame for a deadly attack on the US consulate during one of the first protests, on 11 September.

Ansar al-Sharia, which denies its involvement in the attack that killed US Ambassador Christopher Stevens and three other Americans, quit the city after its base was stormed by Libyans angry at armed groups that control parts of the country.

Elsewhere, in Greece, hundreds of Muslim protesters staged a rally in central Athens today to protest over the film.