ROME — Divers searching the capsized Costa Concordia off a Tuscan island on Wednesday found four bodies, including that of a 5-year-old Italian girl, authorities said.

The national civil protection agency, which is monitoring the operation, said two of the bodies were recovered a few hours after being sighted. It said they are those of a woman and a girl.

It did not identify the two, but only one child’s name was on the list of the missing, 5-year-old Dayana Arlotti. She was on the Mediterranean cruise with her father and his girlfriend. The girlfriend survived; the father is listed among the missing.

The Concordia struck a reef near the island of Giglio on Jan. 13 and capsized. With Wednesday’s development, 21 bodies have now been found. Most of the victims were found on the ship in several days after the accident, and three corpses were recovered from the water a few hours after the collision.

After Wednesday’s discovery of four bodies, 15 people remain missing.