YEREVAN, MAY 30, ARMENPRESS. The Cincinnati Zoo shot and killed a western lowland gorilla on May 29 after a 4-year-old boy slipped into the animal's enclosure, a zoo official said at a news conference, reports CNN.

Harambe, a 17-year-old, 400-pound gorilla, carried the boy around its habitat for about 10 minutes in what the zoo's dangerous animal response team considered a life-threatening situation, Cincinnati Zoo Director Thane Maynard said at a press briefing.

After the gorilla was shot with a rifle, the child was taken to Cincinnati Children's Hospital with non-life-threatening injuries, CNN affiliate WKRC reported.

Maynard said it appeared the boy went under the rail, through wires and over the moat wall.

Two female gorillas were called out of the habitat, Thane said, but the male gorilla went to the moat, picked up the child and began dragging him around the enclosure.

"The child was not under attack but all sorts of things could happen," Thane said. "He certainly was at risk."

Thane said zoo officials decided against shooting Harambe with a tranquilizer because the drug takes effect too slowly.

"You don't hit him and he falls over," Thane said. "It takes a few minutes."

Thane said the zoo security team's quick response saved the boy's life but all the zoo employees are devastated at losing a rare species.

The western lowland gorilla is a critically endangered species, according to the World Wildlife Fund's webpage. In the wild, they can be found in Cameroon, the Central African Republic, the Democratic Republic of Congo and Equatorial Guinea.

Harambe, whose birthday was Friday, was born at the Gladys Porter Zoo in Brownsville, Texas, Thane said. The zoo hoped he would eventually father other gorillas.

The boy was in "imminent danger," leaving the zoo's Dangerous Animal Response Team with no option but to shoot the 450-pound gorilla, zoo director Thane Maynard said in a statement on Facebook. Tranquilizers may not have taken effect in time to save the boy while the dart might have agitated the animal, worsening the situation, Maynard said.

"We are heartbroken about losing Harambe, but a child's life was in danger and a quick decision had to be made," he said.

The words did little to assuage an angry chorus of critics who believed the gorilla's death was unnecessary. Many blamed the boy's mother for failing to look after her son. Neither the boy nor his family have been identified.

Some even suggested the boy's parents should be held criminally responsible for the incident. An online petition seeking "justice for Harambe" through criminal charges earned more than 8,000 signatures in less than 24 hours.

Others criticized the zoo for responding with what they felt was excessive force. Demonstrators gathered outside the zoo on Sunday calling for a boycott.