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Chilean police using tear gas and water cannons arrested more than 400 people among thousands of protesters marching Wednesday in the capital to demand better salaries and working conditions at a time when the economy is booming. Dozens of people, including journalists and a senator, were injured in scuffles with the police, who blocked off the city center. Some police officers also were injured. Thousands of workers from the nation's largest labor federation marched to pressure the government to change laws and improve pay to give workers a portion of the soaring profits Chile's industries have enjoyed in recent years. Local television showed Sen. Alejandro Navarro of the ruling coalition with blood running from a head wound after a riot officer struck him with a truncheon.