According to Los Angeles police, two victims were inside the hillside house in the 3300 block of Oak Glen Drive when the three intruders entered about 4:20 a.m.
The robbers, armed with guns and wearing all black clothing, took unspecified property from the victims. One of those two people was struck, possibly by a handgun, an LAPD spokesperson said.
The intruders fled the scene in a vehicle.
Detailed descriptions of the suspects and the vehicle were not immediately available.