Gunmen on motorcycles have shot dead two Pakistani police officers who were guarding a polio-vaccination team in Quetta, the capital of Balochistan Province, a police official told RFE/RL on August 1. The policemen were escorting the vaccination team during a door-to-door campaign when they came under attack in the Nawa Killi neighborhood of Quetta, local police officer Asif Marwat said. Officials say 2.5 million children under the age of 5 will be vaccinated during the current campaign under way in 35 districts of Balochistan. Militant groups often attack polio-vaccination teams and the police assigned to protect them. Pakistan and Afghanistan are the only countries in the world where polio remains endemic. To read the original story by RFE/RL's Radio Mashaal, click here.