
Anti-government protesters confront riot police on a flyover near the Pearl Square in Manama, March 13, 2011. Bahraini riot police fired thick clouds of tear gas and pushed back protesters who blocked a main thoroughfare leading to the Bahrain Financial Harbour, a key business district in the Gulf Arab region's banking centre.
"Forces from the Gulf Cooperation Council have arrived in Bahrain to maintain order and security," Nabeel al-Hamer, a former information minister and adviser to the royal court, said on his Twitter feed.
Gulf Daily News, a newspaper close to Bahrain's powerful prime minister, reported on Monday that forces from the GCC, a six-member regional bloc, would protect strategic facilities.
A Saudi official said Monday that more than 1,000 Saudi troops, part of the Gulf countries' Peninsula Shield Force, have entered Bahrain where anti-regime protests have raged for a month.
The troops entered the strategic Gulf kingdom on Sunday, the official told AFP, requesting anonymity.