SAN DIEGO—A 41-year-old man was behind bars Jan. 30 for allegedly attacking his parents with a knife during a visit to their Coronado home, seriously wounding them.

Adam Michael Nordhues of La Mesa allegedly assaulted the couple, both 69 years old, without provocation at a condominium complex in the 1700 block of Avenida Del Mundo, just west of Glorietta Bay, shortly before 9 p.m. Jan. 29, according to the Coronado Police Department.

Patrol personnel arrived to find the victims in the lobby of the building where they live. Paramedics took them to a San Diego trauma center for treatment of severe but apparently non-life-threatening wounds.

Officers located the suspect in a parking lot at the complex, still armed with a knife, police said. Mr. Nordhues allegedly ignored repeated orders to drop the weapon and surrender, prompting officers to zap him several times with an electric stun gun. They were then able to take him into custody without further incident.

After being treated at a hospital for minor injuries, Mr. Nordhues was booked into San Diego Central Jail on suspicion of attempted murder, assault with a deadly weapon, and elder abuse. He was being held without bail pending arraignment, scheduled for Thursday afternoon.