LAHORE: Unidentified armed men attacked on Thursday a polio vaccination team in Shalkot area of Quetta city. Two lady health workers were killed as a result of the firing, the police informed. The bodies were shifted to near by hospital for medico-legal formalities. Identities of the deceased were not immediately known. According to media reports, attackers escaped unhurt from the site of the attack, as a heavy contingent of law enforcers and Frontier Corps reached the area.