A rescue effort is underway for a 4-year-old Indiana boy who was swept away in a flooded creek Thursday evening, according to reports.

Carroll County police responded to a call around 6 p.m. regarding a boy who had been swept in the strong currents of Deer Creek, said Lt. Dan Dulin of Natural Resources. Dulin said a witness on a bridge over Deer Creek saw the boy being carried downstream and notified authorities.

Conservations officers were aided by a helicopter, which scanned the creek for about two hours before it became a recovery effort. Rescue officials would search until dark or conditions became too dangerous, Indianapolis’ WRTV reported.

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Officials said it’s unclear how the boy got in the creek, which flows through Delphi, which is about 80 miles northwest of Indianapolis.

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Natural resources officials said yesterday’s heavy rain has caused the creek to swell, resulting in a strong current. Authorities haven’t identified the boy or his family.

The Associated Press contributed to this report.