It seeks to overthrow the government and replace it with a regime based on Islamic law . The doctors were assisting a local hospital , the chief says . Ten suspects have been arrested , but police do n't know who 's behind the attack . On Friday , nine health workers giving polio vaccinations were killed in Pakistan 's largest city .
The doctors were assisting a local hospital , the chief says . Ten suspects have been arrested , but police do n't know who 's behind the attack . On Friday , nine health workers giving polio vaccinations were killed in Pakistan 's largest city .