Authorities were searching for two armed men who pistol whipped a man and a woman inside an apartment in North Hills early Tuesday morning.
The home invasion was reported around 1 a.m. in the 9900 block of Sepulveda Boulevard, according to the Los Angeles Police Department.
Police responded to the scene and found two people suffering from head injuries.
Neighbors were shocked that a crime this violent happened in their apartment building.
"I was surprised because I saw them wheel him out on a gurney and I couldn't believe it," said Randy Laney. "I couldn't believe it. So I just keep my doors locked."
Brent Jones said it was frightening.
"It could happen to anybody," he said. "It can happen anywhere, anytime."
It was unclear what the two men may have stolen from the residence, but one of the victims said he was not able to find his wallet, police said.
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It was also unknown if the victims knew their attackers. The assailants were wearing white T-shirts.
A witness said the men had a dog with them and one said, "Good night," to him in Spanish as they he ran from the crime scene.
Kathy Vara and Oleevia Woo contributed to this report.