Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Iraqis Vote in Crucial Election Several mortar shells land near voting stations as polls open. 06 March 2010 Polling stations are open across Iraq in a parliamentary vote seen as a key test of Iraq's ability to maintain security and conduct a smooth transition of power after the U.S.-led invasion in 2003. Some 20 million eligible voters are choosing from more than 6,000 candidates for the country's 325-seat parliament. Polling stations will remain open until 5 p.m. local time Sunday. Security is tight throughout the country, with tens of thousands of Iraqi soldiers and police officers patrolling the streets to prevent possible attacks. Police say several mortar rounds were fired at voting centers in Baghdad as polls opened. There are no initial reports of serious injuries. On Saturday, a car bomb ripped through two tour buses in the Iraqi city of Najaf, killing four people and wounding more than 50 others. An al-Qaida-affiliated group, the Islamic State of Iraq, has warned that anyone who decides to vote will risk death. Security was stepped up in Iraqi cities, as well as along the country's borders with Iran and Syria ahead of Sunday's parliamentary vote. The borders have been sealed, the airport closed and vehicles banned across the capital. The second-ranking U.S. military officer in Iraq, Lieutenant-General Charles Jacoby, told reporters Saturday that Iraqis have shown they have the capacity to run a safe, legitimate election on their own. There are no clear frontrunners. Many voters likely will choose among the three major Shi'ite-led coalitions. Iraqi Prime Minister Nouri al-Maliki's State of Law Coalition and former Prime Minister Ayad Allawi's Iraqiya bloc have both reached out to Sunnis and other minority groups. A third Shi'ite coalition, the Iraqi National Alliance, has been playing up its sectarian profile and has strong ties to Iran. It has been getting support from followers of anti-American cleric Moqtada al-Sadr. On Saturday, Sadr encouraged Iraqis to take part in the vote and give their support to those who can best serve the nation. Millions of Iraqis living overseas in 14 countries, as well as Iraqi soldiers, police, medical staff, patients and prisoners, have already cast their ballots in early voting. The poll is only the second parliamentary election in Iraq since the U.S.-led invasion that ousted Saddam Hussein in 2003. It is being monitored by the United Nations, the Arab League and various international groups, as well as some 200,000 Iraqis. Unlike the previous national election in 2005 when Iraqi Sunnis boycotted the polls, many of them say they plan to participate. Some information for this report provided by AP, AFP and Reuters. .