Four Iraqi protesters were killed and 25 wounded on Friday amid ongoing clashes with security forces near a strategic bridge in Baghdad, security and medical officials said.\r\nThe clashes come just hours after some of the\u00a0most intense street altercations in recent days, which killed 10 protesters and injured over 100. Security forces used tear gas and live ammunition to repel demonstrators in clashes that lasted into Thursday night.\r\nThe officials said one protester was killed Friday by live ammunition, while the other three died because of tear gas. It was not immediately clear if they died from inhaling the gas or from a direct hit by a tear gas cannister, which has caused several other deaths in recent weeks. The officials spoke on condition of anonymity in line with regulations.\r\nThursday\u2019s clashes took place on Rasheed Street, a cultural center known for its old crumbling buildings. The street is close to Ahrar Bridge, a flashpoint in recent days. Protesters are partly occupying three Baghdad squares and parts of three bridges in a standoff with security forces.\r\nGrand Ayatollah Ali al-Sistani, the highest Shiite religious authority in Iraq,\u00a0reemphasized calls to political parties to pass electoral reform laws\u00a0and respond to the protesters\u2019 demands. His comments were carried in his weekly sermon.\r\nIraq\u2019s massive anti-government protest movement erupted October 1 and quickly escalated into calls to sweep aside Iraq\u2019s sectarian system.