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Houston Police Department officers said they responded to a shooting call at 4905 Denmark Street near Lockwood Drive at about 12:30 p.m.
According to police, an 8-year-old boy got access to the firearm and shot the 5-year-old.
The 5-year-old was reportedly taken to the hospital with a gunshot wound by his father but was later transported by LifeFlight to Memorial Hermann in critical condition.
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Police said the 8-year-old appeared to have a cut on his head and was also taken to the hospital in stable condition, although it's unclear how he may have received that injury.
HPD said the two boys are family friends.
Authorities said they are still investigating what exactly led to the shooting.
Three people have been detained for questioning, but no charges have been filed, police say.
No other injuries were reported.