* Local media report U.S. marines flown into Yemen
* At least one person died in a protest on Thursday
* Unrest follows film Muslims deem blasphemous
Security forces in Yemen blocked streets surrounding the U.S. embassy in Sanaa on Friday, bracing for more protests against a film deemed blasphemous to Islam, a day after demonstrators stormed the heavily fortified compound and clashed with police.
Early on Friday, around 20 to 30 people had gathered on the north side of the embassy, carrying placards and shouting slogans against the film, which depicts the Prophet Mohammad in terms which many Muslims have described as crude and insulting.
"We will carry on demonstrating until the United States bans that film," teenage demonstrator Mahmoud said.
A soldier on duty near the embassy told Reuters security forces were expecting more demonstrators to arrive after Friday prayers, which begin at 0930 GMT.
Local media reported on Friday that a group of U.S. marines had flown into Sanaa's international airport on Thursday to bolster the embassy's security. A spokesman for the U.S. embassy in Sanaa declined to comment on the reports.
At least one person died and 15 were injured at Thursday's demonstration, which started as a peaceful march but quickly turned violent when protesters threw stones and placards before attacking the security offices and the compound.
No U.S. embassy staff were hurt, but Yemen's President Abd-Rabbu Mansour Hadi condemned the attack, saying Yemen would launch an investigation.
The embassy told U.S. citizens it expected more protests against the film and that it would be closing its consular services on Saturday.
"U.S. Embassy Sanaa informs U.S. citizens of continued demonstrations in the vicinity of the embassy, and the security situation remains fluid," the embassy said in a statement posted on its website late on Thursday.
The embassy is always closed on Thursdays and Fridays, which are not working days in Yemen.
The Yemeni protest followed Tuesday night's storming of the U.S. Consulate and a safe house in Benghazi, Libya, in which the U.S. ambassador to Libya and three other Americans were killed. President Barack Obama said the perpetrators would be tracked down and ordered two destroyers to head to the Libyan coast.
The Libyan authorities have said they had have made four arrests in the investigation into the attack that killed Ambassador Christopher Stevens and the three others.
Amid fears the protests could spread to other countries in the Muslim world, demonstrators also attacked the U.S. embassy in Egypt on Thursday.
Protesters blamed the United States for the film, posted on YouTube under several titles, including "Innocence of Muslims". Washington has condemned the film.