CHICAGO (CBS) — Dive teams planned to return to the Fox River near the Grand Victoria Riverboat Casino in Elgin on Thursday, to resume searching for a man who disappeared in the water on Wednesday.

The Elgin Fire Department said witnesses saw a man wade into the river around 10:30 p.m., and slip under the surface of the swift-moving water. The man, who appeared to be about 40, did not resurface.

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A fire boat and divers already operating nearby for the local July 4th fireworks show began searching the water within minutes, but did not find anyone Thursday night.

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“At no time did they ever see or hear anyone in distress in the river,” the Elgin Fire Department said in a statement.

Additional rescue crews were brought in from neighboring suburbs, and the search continued until about 3 a.m., when it was suspended due to safety concerns.

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Crews planned to resume the search Thursday morning.