The death toll from a shooting near a Shiite mosque in Oman’s capital on Tuesday has risen from four to six and now includes a policeman, the Omani State-run news agency reported. The agency, citing a police statement, said three attackers were also killed. There were 28 people from various nationalities who were injured in the attack, the police said. “The Royal Oman Police and the military and security services have completed the procedures for dealing with the shooting incident that occurred in the Wadi Al Kabir area in the Muscat Governorate,” the police statement said. The attack occurred…