MEXICO CITY (AP) — Churches stood empty Sunday in predominantly Roman Catholic Mexico City after services were canceled, and health workers screened airports and bus stations for people sickened by a new strain of swine flu that experts fear could become a global epidemic. Mayor Marcelo Ebrard said two more people died of swine flu overnight in the overcrowded capital, and another 73 more people were hospitalized with influenza, possibly swine flu. President Felipe Calderon has assumed new powers to isolate people infected with the deadly swine flu strain that health officials say has killed up to 86 people.