State Police are investigating an overnight shooting that wounded one person at the Shinnecock Indian reservation and led to the arrest of another on a charge of impeding police, authorities said Saturday.

The shooting happened in the area of Little Beach Road, police said, and troopers learned of the shooting at 12:40 a.m. after Southampton Hospital notified them, as required by law, that it was treating a gunshot victim.

The victim, whose name and gender were not released, was stabilized and airlifted to Stony Brook University Hospital, police said.

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Troopers searching the area found a loaded handgun, and a forensics investigation will help determine if it is the weapon that was used, police said.

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One of the reservation's residents, Mark M. Williams, 33, was charged with obstructing an investigation when he "defied lawful orders" to stay clear of the crime scene and kept demanding details of the police activity that was focused on the public street, said Lt. Jose Febo of the Riverhead barracks.

Police declined to provide additional details, citing the ongoing investigation.

Last month, State Police said two people suffered nonlife-threatening wounds in a shooting at the reservation. In that shooting, Southampton Hospital notified police at 12:45 a.m. June 15 that two gunshot victims had walked in, police said.

The victims had said they were at a memorial service at the reservation when a dispute escalated into gunfire, police said at the time. But tribal spokeswoman Beverly Jensen said the two were not members of the Indian nation and that she does not know why they were at the reservation.