The Bahraini government is intensifying a crackdown on Shiite-led anti-government protests. On Thursday, at least six opposition leaders were arrested as state forces attacked protesters in a central square in the capital city of Manama. At least six people were killed and more than 1,000 wounded in the assault. Bulldozers were then used to clear out encampments used by protesters. State forces have also been deployed to surround Shiite neighborhoods. Opposition leaders are calling for a U.N. probe into the crackdown and for the withdrawal of all foreign forces deployed by Saudi Arabia and the United Arab Emirates to back the Bahrain government. The United States has refused to condemn the Bahraini government’s assault on protesters.