Pictured: Barrier Designed to Keep People out of Gorilla Enclosure at Cincinnati Zoo

June 2, 2016 Updated: June 2, 2016

A small fence, which appears to be quite easy for a child to climb, surrounds the moat in a gorilla enclosure a 3-year-old boy fell into over the weekend at the Cincinnati Zoo.

The metal and wire barrier was placed around it, and only a small hedge appears to separate the barrier from a fall into a deep moat.

After the boy fell into the enclosure on Saturday, a gorilla, named Harambe, picked up the child and dragged him around for an estimated 10 minutes before the ape was shot and killed, triggering widespread public outcry this week.

A warning sign in the photo can be seen, reading “BE ALERT! Gorillas are known to throw objects such as clumps of dirt.” The photo is estimated to be about four years old, reported the Mirror.

Another photo posted on Twitter purports to show the barrier.

But on Thursday, the Cincinnati Zoo said it would be upgrading the barrier.

The three-and-a-half foot tall barrier will feature wood beams and rope netting.

Cincinnati Zoo director Thane Maynard said the barriers made the enclosure safe. “We all need to work to make sure our families are safe. Do you know any four-year-olds? They can climb over anything,” he said. “Any of us could climb over barriers if we choose. As I said, you can lock your car or lock your house, but if someone wants to get in, they can.”

Cincinnati Zoo’s gorilla display has been shut down to the public since the shooting.

On Thursday, Cincinnati police turned over the results of their investigation to a prosecutor. They investigated the actions of the family of the 3-year-old boy.

The Hamilton County prosecuting attorney said in a statement that the case will be reviewed.

“The Cincinnati Police Department has finished their investigation into this matter and turned their investigation over to the Hamilton County Prosecutor’s Office for review. Hamilton County Prosecutor Joseph T. Deters will review this information,” the office stated.