Two of the five killer whales captured off the coast of Wakayama Prefecture in February have died at an aquarium there, according to civic groups working for their return to the sea.

The youngest of the five whales, a 2- or 3-year-old male, died June 14, said a representative of the Dolphin and Whale Action Network. The second, a female reported to be pregnant when captured and which may have miscarried in April, died June 17, the group said.

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