The video above is from ABC13's Live Streaming Channel.
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The incident happened in the 8300 block of Cullen Boulevard and Bellfort in the Sunnyside area.
Preliminary information from the METRO Police Department, who assisted HPD, says the stabbing happened after a possible altercation that spilled over to a bus stop.
ABC13's SkyEye arrived just as a man was being loaded onto an ambulance before leaving the scene.
Officials have said the man was taken into surgery.
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METRO police officers were also on the scene, placing crime scene tape to secure the area.
Police said one person was taken into custody.