A Newfoundland and Labrador whale expert is warning boaters not to get too close to crcas near the province's coasts.

"Killer whales will come in and actually get right underneath the propeller of the boat. They will get right up underneath the boat and an erratic movement … a flick of their tail," Wayne Ledwell who operates a whale release program.

"These are big animals, they're upwards of five to eight tonnes. They could tip over a boat."

At least three people in eastern Newfoundland have videotaped orcas in August attacking prey near in Tors Cove, Torbay and Trinity Bay.

Although its unusual to see orcas in Newfoundland and Labrador coastal waters, it's believed that hundreds of them live near the province.