US President George W. Bush said on Thursday the London blasts showed the war on terrorism must continue.
"The war on terrorism is on," Bush told reporters on the sidelines of the Group of Eight summit here.
Meanwhile the nationwide US rail system Amtrak said it raised its security alert level on Thursday, after coordinated terror blasts in London.
"Amtrak has increased the railroad's security threat level in response to the terrorist bombings in London's transit system," Amtrak said in a statement.
Washington had earlier increased security precautions on its subway system.
AFP
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