The incident happened in the city of Galveston just before 10 am on Wednesday with the bridge, which is 3,239 feet long, now closed until authorities deem it safe.
The nine-year-old boy comes within inches of being hit, sat in his house in Fort Worth with his two dogs.
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Law enforcement moved in on the encampment on the university’s South Lawn before deploying the measures to disperse those that had gathered on Monday.
Police have arrested several demonstrators.