BAGHDAD (AFP) - A US soldier was killed in a blast during a patrol in northern Iraq's Nineveh province, the American military said on Thursday. The soldier was killed on Wednesday. The latest death brought the number of US troops killed in Iraq this month to 50 and to 4,062 the military's total losses since the March 2003 invasion, according to an AFP count based on independent website www.icasualties.org. April was the deadliest month for the US military since September 2007, when at least 65 soldiers were killed. The clashes have largely focused on the southern section of Sadr City, the sprawling Mahdi Army stronghold. The lowest casualties so far in 2008 were in February with 29 soldiers killed.