US are to held celebrations on the occasion of its national holiday under tight security measures.

The guard of the airports and the underground stations in the state of Washington all over the country has also been strengthened.

Patrols with specially trained dogs are to check the public transport.

The visitors, who want to enjoy the celebration parades and concerts in the area of Washington, will have to go through numerous check points.

The authorities strengthened the security measures in New York, Boston, Philadelphia, Houston and Baltimore.

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