KHAR (AFP) - Two new polio cases have been confirmed in Pakistan, bringing the total number of sufferers of the crippling disease in the country to 20 this year, health officials said Tuesday. Unrest in northwestern Swat and tribal areas bordering Afghanistan have hindered anti-polio vaccination teams from reaching a large number of children. The first of the latest cases was confirmed in Nawagai village in Bajaur tribal district in a 16-month-old boy, and the second was detected in a 10-month-old boy in southwestern Balochistan. "A case of P3 polio virus has been confirmed in Nawagai. The parents had refused to give vaccination drops to their son," district support officer Hameedur Rehman told reporters. Authorities confirmed that the second case in Ragoor village in Balochistan, which borders Afghanistan and Iran, was the P1 type. "We have really been alarmed by this case since we were hoping to make the province and the country polio free," district health official doctor Rehmat Ullah told AFP. Ullah said a regular vaccination drive was progressing well in the area on Tuesday. But officials said polio vaccination teams in northwestern Swat valley were stopped Tuesday and some of the health workers were beaten up. Two polio cases were detected in that area earlier this month.