US health officials have confirmed they were delayed in responding to the swine flu outbreak because of Bush administration rules imposed after the 9/11 attacks. The Financial Times reports Mexican officials sent samples from infected patients in mid-April. But US restrictions on imported biological materials meant the samples first had to be sent for analysis in Canada. American scientists had already analyzed several swine flu cases without realizing it was the same virus. There have now been two confirmed swine flu deaths in the US, both in Texas.