Updated 12:55 p.m. to include additional information about stab wounds and weapons.
A search was under way Thursday for two men and a woman wanted in connection with a home invasion robbery in Imperial Beach that sent a woman to the hospital after being stabbed twice in the back, authorities said.
At least one of the suspects was wearing a skull mask, but it is not yet known if it is the same person who on Palm Avenue, a sheriff's watch commander said.
The robbers knocked on the door of the residence in the 200 block of Dahlia Avenue shortly before midnight and forced their way in after someone inside answered, San Diego County sheriff's Lt. Maria Wood said.
Inside were a husband and wife, a third adult roommate and a child, she said.
During an ensuing fight between the robbers and the adult residents, the wife was stabbed, Wood said, adding that paramedics took her to a UCSD hospital to be treated for non-life-threatening injuries.
The San Diego Police Department, a K-9 unit from the sheriff's Lemon Grove station and a sheriff helicopter assisted in establishing a perimeter.
Armed with a gun and knives, the robbers made off with a laptop computer, Wood said.
City News Service contributed to this report.