PANORAMA CITY (CBSLA) — Two men were shot and killed just outside a Denny’s restaurant in Panorama City early Friday morning.

The shooting was reported at about 3:20 a.m. at the corner of Van Nuys Boulevard and Chase Street, according to Los Angeles police.

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The two men, who were in their 20s, were sitting on a bus bench when a person with a gun walked up and opened fire. One of the men was declared dead at the scene, while the second died at a hospital.

Police say the shooting may have been gang-related.

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The shooting was not connected with the diner. People who were inside the restaurant are not cooperating with detectives, police said.

Van Nuys Boulevard was closed between Roscoe and Parthenia Street during the investigation.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. City News Service contributed to this report.)