Police called off a search for wreckage in the Ottawa River late Tuesday afternoon after crews were unable to locate any sign of something crashing into the water.

Search crews scoured the river for 15 hours after police received reports that a plane may have plummeted into the water late Monday night.

A military helicopter from CFB Trenton conducted an aerial search of the river, buzzing over an area of interest, downstream from the Deschenes Rapids on Tuesday.

Earlier in the day, sonar equipment identified something about 30 feet underwater. It is unclear what that item may have been.

Police said since they hadn't received any reports of a missing airplane, or found anything unusual after so many hours of searching; they decided to cancel their search.

Police received several calls at about 10 p.m. Monday, reporting engine noises and a bright light descending into the Ottawa River near the rapids, located across from the Britannia Yacht Club.

Police and search and rescue teams searched the river and its shoreline until just before 4 a.m. Tuesday. The search resumed later Tuesday morning before it was called off at about 4 p.m.

Police said they're still not sure what people saw in the sky Monday night. However, investigators say it likely wasn't a meteor, though they speculate it might have been fireworks or a flare.

With a report from CTV Ottawa's Kate Eggins