Photos from the scene show the booms still standing, although one appears damaged and partially collapsed.
The accident was reported shortly before 10 a.m. local time at 1600 Robert Browning Street, reports said.
The development is a few miles north of downtown in a rapidly growing neighborhood that includes residential, retail and office space, according to The Associated Press. A children’s hospital is located near the accident site.
An office building was under construction at the site, but it was unclear whether any part of the structure was harmed during the collision.
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