SOUTH LOS ANGELES ( — A security guard was killed and three other men were wounded in a shooting during an attempted armed robbery at a popular marijuana dispensary in South Los Angeles Wednesday night.

The shooting occurred at 9:50 p.m. at a pot shop in a nondescript building on South Broadway, just south of Imperial Highway, near the 10 Freeway. Los Angeles police arrived to find a male security guard dead on scene.

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A second man was rushed to a hospital, where he underwent surgery for gunshot wounds to the chest, police said. Two other suffered non-life-threatening gunshot injuries. No names were released.

According to police, three or four male suspects were attempting to rob the dispensary when the shooting occurred. They remain at large. Investigators were on scene for several hours well into Thursday morning collecting evidence.

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According to police, a security guard was also shot and killed at the same pot shop about one year ago. The details of that shooting were not immediately confirmed.

Meanwhile, a second shooting occurred minutes later, about a half-mile from the pot shop. At 9:53 p.m., police responded to a shooting of a 40-year-old man at West 115th and South Spring streets. He was taken to a hospital with unknown injuries.

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Investigators do not believe the two shootings are connected, police told CBS2.