A man told police he heard glass break shortly before 8 a.m., then saw two gun-wielding suspects in their late teens or early 20s inside his home in the 7900 block of Avenida Alamar, San Diego police Officer Luis Roman said.
The suspects left empty-handed, and weren't located in a subsequent search of the neighborhood, he said.
A witness described the suspects' vehicle as a dark blue or purple 1990 to 2000 Honda or Toyota sedan with tinted windows, Roman said. A detailed description of the suspects was not immediately available, though police said one of the suspects was wearing a bandana.
The two people were heard driving a vehicle toward Paseo Durado.
No injuries were reported.
Police were also investigating a series of robberies around San Diego where armed men use a lost-dog scam to rob victims.
Anyone with information on any of the robberies was urged to contact police at 619-531-2000 or Crime Stoppers at 888-580-8477.