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Just two months earlier militants used a pressure cooker bomb to attack the US-based Christian aid group World Vision in north-west Pakistan, killing six local employees.Obama called the attacks, which no one has yet claimed responsibility for, a “heinous and cowardly act”.He added: “The American people refuse to be terrorised.“We do not know whether this was an international or domestic organisation, or perhaps by a malevolent individual.“It is a heinous cowardly act and the FBI is investigating it as an act of terrorism.“If you want to know who we are, what America is, how we respond to evil, that’s it: Selflessly, compassionately, unafraid.”