A 22-year-old man suspected of two massage spa robberies in Poway has been arrested, authorities said Wednesday. Poway deputies responded about 8:30 p.m. Saturday to Poway Spa on Pomerado Road, near Ninth Street, after a woman reported that a masked man had entered the business, threatened her with a knife, demanded money and struck her in the face, according to the Sheriff’s Office. Minutes later, another robbery was reported at the Lavender Spa, about 2½ miles away on Poway Road, near Sabre Springs Parkway. Sheriff’s officials said the victim gave a similar description of the man who was suspected in the first robbery. According to the Sheriff’s Office, license plate reader data confirmed the vehicle had been near both spas during the robberies.