Shia militiamen clashed with a detachment of Iraqi President Fuad Masum’s bodyguards Thursday in Salahaddin province, denying them passage and confiscating their weapons and vehicles.The conflict threatens to further aggravate long-standing tensions between Shia militias and Kurdish security forces in the disputed territories of northern Iraq, which are subject to competing claims by Kurds, Arabs, Turkomen, and others. Armed Kurdish protesters have subsequently blocked roads and scuffled wit…