The video above is from ABC13's 24/7 livestream.
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Houston police said officers responded to reports of a threat at about 2:40 p.m. at the hospital in the Texas Medical Center. At the scene, officers did not find anything and things are being cleared up.
A spokesperson for the hospital said they are no longer on lockdown, and the hospital is resuming its normal operations.
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It's unclear who made the threatening call or why. This story will be updated as more information becomes available.