Police said they were called to Bauer Pocket Park just before 1:15 p.m. Thursday.
"I heard some loud noises. Six to eight shots," Tuan Ho, who was working nearby, said
When police arrived, they found a teenage boy lying facedown at the base of a playground slide and a man dead just outside the park with a gun near his body.
The names and ages of the victims have yet to be released.
Chris Robinson said he saw a man with a gun walking away from the park in the immediate aftermath of the shooting.
"I saw him pointing his gun just straight up Bauer Street and didn't shoot at anybody there. But the other guy in the park was already down," Robinson said.
Both Robinson and Ho say they then saw the man with the gun return to the park.
"He was flipping the body over to see if he was still alive, and then he walked towards this other guy, and then they just took off," Ho said.
"They seemed pretty casual, I guess, about the whole thing. They didn't run," Robinson said.
Police added that they found the teen they were questioning a few blocks from the scene.
Officers initially said all three people involved in the shooting had been accounted for, including the two victims.
HPD later told Eyewitness News that video footage led them to believe others could also be involved.
At the moment, the police said the teen in custody is considered a witness in the investigation.
People in the area say the neighborhood is generally quiet, and they're shocked to see it become the scene of a fatal shooting.
"I do see some sketchy stuff sometimes, like kids hanging out, smoking weed, drinking. I don't pay no attention to it because it's a park. But for this to happen, it's pretty crazy," Ho said.
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