The explosion was heard throughout the city The base houses a weapons depot for the Iraqi federal police and mainly Shiite militias BADHDAD: Iraq’s interior ministry says a large explosion at an ammunition depot southwest of the capital, Baghdad, has injured 13 people, most lightly. Maj. Gen. Saad Maan, a ministry spokesman, said it was not immediately clear what caused the blast at the Al-Saqr military base. The explosion was heard throughout the city and smoke billowed in the air Monday evening. The base houses a weapons depot for the Iraqi federal police and the mainly Shiite militias known as the Popular Mobilization Forces. The state-sanctioned PMF militias, which also receive backing from Iran, have fought alongside Iraq’s regular armed forces against Daesh