MOSUL (AFP) - Six people were killed and more than 50 wounded Wednesday in bombings in northern Iraq, where US and Iraqi forces have been struggling to root out insurgents, police said. In the largest attack, a car bomb ripped through a crowded market area in the town of Sinjar, northwest of Mosul and near the Syrian border, killing four people and wounding 42, Sinjar police lieutenant colonel Fathi Jabburi told AFP. No further details were immediately available. Earlier Wednesday, a bomb exploded in a Mosul street as an Iraqi police patrol cruised past, injuring several people, local policeman Ahmed Abdul Karim told AFP. As people rushed to help the wounded a second bomb detonated, killing two people, he added. No police were injured in the attacks. Two US soldiers died from injuries sustained in attacks in Baghdad and executed President Saddam Hussein's hometown of Tikrit, the US military said. "A soldier died from wounds sustained during a mortar attack in Baghdad on Wednesday," a first statement said without elaborating. "A US soldier wounded during combat operations on Tuesday in Tikrit died Wednesday," a second statement said. The deaths take to 4,220 the number of US military personnel who have died in Iraq since the 2003 invasion, according to an AFP tally based on the independent website Meanwhile, Iraqi Prime Minister Nuri al-Maliki and fellow ministers are due to arrive in Tehran on Saturday for a two-day visit, Iran's official IRNA news agency reported. "Nuri al-Maliki, Iraq's prime minister, will come to Tehran on Saturday, January 3," Iraq's Ambassador to Iran, Muhammad Majid al-Sheikh, told the news agency. The two-day visit has an economic agenda and the two neighbours are due to follow up on trade deals already signed, the Ambassador said. Trade, electricity and transport ministers are due to accompany Maliki, he added. The visit had initially been scheduled for late December. It will be Maliki's fourth visit to Iran since taking office in 2006 but the first since the signing of a bilateral security agreement that paves the way for US troops to remain in Iraq until the end of 2011, a deal that did not please Tehran.