Johnson said US authorities have ramped up security preparations in light of the rise of "lone wolf" type attacks, including recent atrocities in France and Germany in which jihadist-inspired attackers drove trucks into large crowds.
But he stressed: "We know of no specific credible threat" to the massive event, addressing reporters at a secure communications facility west of the capital.
He said 700,000-900,000 people are expected for the Washington event, including 99 different protest groups. Some 28,000 security officials will be deployed.
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