Gulf states send force to Bahrain following protests
14 March 2011 Last updated at 16:50 GMT
Troops from a number of Gulf states, including Saudi Arabia, have arrived in Bahrain in response to a request from the small Gulf kingdom, officials say.
It comes a day after the worst violence since seven anti-government protesters were killed in clashes with security forces last month.
Dozens of people were injured on Sunday as protesters pushed back police and barricaded roads.
The BBC's Caroline Hawley has more details.