The police pulled at least four alligators out of the water in their search and set them down to search for the body of the little boy.
During the frantic search, the officers killed the reptiles to see if there were any human remains left inside.
Divers discovered the body of two-year-old Lane Graves intact after a 16-hour search.
The Nebraska swamp was pulled into the water as it paddled on the shore.
Animal welfare leader PETA blamed the murder of the alligators, arguing that the creatures "only did what seemed natural to them".
The little boy's parents watched in horror as the reptile clenched his jaw before dragging him to Seven Seas Lagoon, near the five-star Grand Floridian Resort & Spa in Orlando.
His father desperately tried to save his son but could not get him out of the Alligator's pines.
PETA President Ingrid Newkirk said, "Disney, who knew there were alligators in this water, should have warning signs installed, as it is not news that alligators are natural predators.
"But now a child and four alligators who only did what they took for granted paid for their lives."
Disney World said that alligator warning signs and temporary barriers were installed following the tragic incident at Florida resorts.
The boy's parents said they were "overwhelmed with support and love they have received since the death of their son.
Jerry Demings of the Orange County Sheriff said, "The father went into the water and tried to grab the child, but he failed, and I was told that at some point the mother went into the water too."
When the child played in the water with his mother, the alligator, who was supposed to be between four and seven feet long, it crashed.
The desperate family alerted a nearby lifeguard who made desperate attempts to save the child without success.
Mr. Demings continued, "As they waded into the water along the shore at that time, the alligator attacked.
"We do not go until we have the baby, and as a father and grandfather, we hope for the best in these circumstances, but with 35 years of experience, we know we are facing some challenges."
A Disney spokesperson added, "Everyone here at Walt Disney World has been devastated by this tragic accident."