Officials said a gas leak caused an explosion today at Dubuque’s wastewater treatment plant, though no injuries have been reported. Dubuque Police Department Lt. Luke Bock confirmed there was an explosion at the Water & Resource Recovery Center. No injuries have been reported and all staff are accounted for. A preliminary assessment indicates that a gas leak caused an explosion in the sludge processing building at the plant. The explosion caused interior damage, and officials are conducting a full assessment. Dubuque police and firefighters remained on scene at about 1:40 p.m. Officials said more information will be released when it is available.