?Things need to change,? May says as death toll rises to 7 after London attack

The British prime minister blamed the "evil ideology of Islamist extremism" after the third terrorist incident in her country in three months. The low-tech but high-profile attack will raise questions about how British security services failed to stop yet another mass-casualty strike after years of thwarting such attempts. The three attackers, who injured at least 48 people, were fatally shot by police minutes after the first emergency call.
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