By Anita Oh

PHILADELPHIA (CBS) — An Olney homeowner is speaking out after he says four suspects robbed him Wednesday afternoon at gunpoint in front of his nine-month-old son.

“I’m angry,” said 44-year-old Khamphoy Detmongkhoune. “My life doesn’t matter, but I’m worried about my son’s life.”

Surveillance video around 3:15 p.m. on Wednesday shows the first suspect in a postal worker uniform approaching the victim outside of his home on the 5400 block of North 2nd Street.

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“By the time I put my child in the car, I wasn’t paying attention. I turned back and he was behind me,” he said. “He said he got a package for me.”

Instead, Philadelphia Police Capt. Malachi Jones says that suspect pulled out a gun and forced the victim inside his home, zip-tying and pistol-whipping him.

“We don’t believe it was a postal worker that committed this robbery but somehow this person got a hold of a uniform,” Jones said.

Three other suspects waiting nearby are also caught on camera going into the home.

“We do believe, based on the timing, that it’s very possible it was in fact a targeted robbery,” he said.

The four suspects got away with $5,000 cash, an iPhone 7, as well as both car and house keys.

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The homeowner says he just moved into this house a year ago.

“I don’t feel safe at all,” he said.

Police describe the suspects as four black men, who got away in a black Buick Lucerne and a gray Pontiac with a spoiler waiting nearby.

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The first suspect is described as 5-foot-5 in his early to mid-20s, wearing a U.S. Postal Service uniform and black and white sneakers.

The second suspect is described as 5-foot-9 with a stocky build, wearing a dark hooded jacket, black gloves, dark colored pants, black mask, and black shoes.

The third suspect is described as 6 feet tall with a thin build, wearing a dark colored hooded jacket, black gloves, black mask, tan boots with no laces.

The fourth suspect is described as 5-foot-10 with a thin build, wearing a black hooded jacket, black gloves, black mask and black sneakers.

If you recognize them, call 215-686-TIPS.