A June 20, 2015 photo provided by the Cincinnati Zoo and Botanical Garden shows Harambe, a western lowland gorilla, who was fatally shot Saturday, May 28, 2016, to protect a 4-year-old boy who had entered its exhibit. (Jeff McCurry/Cincinnati Zoo and Botanical Garden via The Cincinatti Enquirer via AP)
A June 20, 2015 photo provided by the Cincinnati Zoo and Botanical Garden shows Harambe, a western lowland gorilla, who was fatally shot Saturday, May 28, 2016, to protect a 4-year-old boy who had entered its exhibit. (Jeff McCurry/Cincinnati Zoo and Botanical Garden via The Cincinatti Enquirer via AP)

Cincinnati — The Cincinnati Zoo said Thursday it will re-open its gorilla exhibit next week with a higher, reinforced barrier after a 3-year-old boy got into the enclosure, leading to the fatal shooting of a male gorilla.

Zoo spokeswoman Michelle Curley said the outer barrier will now be 42 inches high — a half foot taller than before — with solid wood beams on top and at the bottom, plus knotted rope netting at the bottom.

The zoo said there had been no earlier breaches in Gorilla World’s 38-year history and that the previous barrier had passed multiple inspections by the Association of Zoos and Aquariums, which accredits zoos.

“Our exhibit goes above and beyond standard safety requirements, but in light of what happened, we have modified the outer public barrier to make entry even more difficult,” zoo Director Thane Maynard said in a statement.

Meanwhile, a prosecutor was reviewing the police investigation into the parents of the boy, who fell some 15 feet Saturday into a shallow moat after apparently climbing over the barrier. A special response team shot and killed a gorilla, 17-year-old Harambe, after concluding the boy’s life was at stake.

Today is “the earliest” Hamilton County Prosecutor Joe Deters will make a decision on charges, spokesman Triffin Callos said. Legal experts have told The Associated Press that a prosecution in the case seems unlikely.