Police in southern Alberta will be continuing with the second day of their aerial search of the major rivers in the province, in an attempt to bring closure to the families whose loved ones have gone missing.

On Tuesday, the RCMP, along with the help of local police and fire services, began searching the Bow and Saskatchewan Rivers in Calgary, as well as the district near Lethbridge and Medicine Hat by the air.

This isn't the first time that such a search has been conducted by police. Five years ago, the bodies of five people who had gone missing from the City of Edmonton were found in a similar search of the North Saskatchewan River.

While police aren't looking for any specific missing persons, they say that there are 27 people unaccounted for in Alberta right now. Authorities in Calgary say that they're certain that three people have gone missing in the Bow River and Lethbridge police are looking for any sign of four people who have gone missing in the Oldman River.

Officials say the search is done at this time of year because the water levels are lower and visibility is much better for crews.

The aerial search is just the first phase of the operation. If anything is found from the air, then teams on the ground will be alerted to take a closer look.

The search of the Bow River wrapped up at about 2 p.m. and it turned up nothing, but crews will be patrolling the waters south of the city on Wednesday.