Beluga whales entered the Kenai River Tuesday morning and could be seen swimming near the Warren Ames Memorial Bridge.
Motorists stopped to observe, but authorities were unaware of the beluga activity.
"That's news to me," said Pam Russell of the Alaska Fish and Game Department.
Russell said she didn't know what the whales might be doing in the river.
"I don't know if they're just out there playing or what," she said.
She said that the whales normally swim into the river at high tide, and that if they remain in the area "they'll come up with the next high tide."
The National Marine Fishery Service was also unaware of the presence of whales in the river. Authorities said they may dispatch a boat to observe the whales.
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