Two shark attacks happened within about an hour Sunday in Oak Island, North Carolina, leaving a young girl and teenage boy with severe injuries. 

In the 911 call, which we heard on "America's Newsroom" this morning, a panicked beachgoer told the 911 dispatcher that the girl's hand had been "bitten off."

"It looks like her entire hand is gone," the woman said. 

The 12-year-old girl ended up losing part of her left arm and may also lose her left leg. In the second attack a few miles away, a 16-year-old boy lost his left arm. 

Both victims are reported to be in stable condition. Both attacks occurred in waist-deep water near the Oak Island fishing pier.

It's unclear if one shark or multiple sharks were responsible. 

The mayor said authorities tried to alert everyone to get out of the water after the first attack, but there was not enough time. 

A 13-year-old girl was also bitten by a shark in Oak Island last week, suffering lacerations on her foot.

Listen to the 911 call above.

Bill Hemmer discussed the terrifying attacks with Discovery Channel "Shark Week" expert Joe Romeiro. Hemmer asked whether the presence of a fisherman's bait in the water could have played a role in the attacks. 

Hemmer pointed out that locals believe there may have been bait in the water at the time, with fishermen attempting to lure sharks or other big fish. 

Romeiro said trying to catch a shark from shore is a "big growing trend," advising beachgoers not to swim in areas where people are fishing. 

Watch his full analysis above.