Two monkeys are believed to have been taken from Dallas Zoo following a string of bizarre incidents at the attraction.

Dallas Police said no arrests had been made in any of the investigations – which also included cages being cut and the suspicious death of an endangered bird – and did not confirm whether the incidents were linked.

In the latest case, officers believe someone cut an opening in an enclosure and took the two emperor tamarin monkeys, which are small primates with long whiskers that resemble a moustache.

“It was clear the habitat had been intentionally compromised,” the zoo said in a statement.

Earlier this month, the zoo closed for a day-long search when a clouded leopard named Nova went missing.

She was eventually found near her habitat, but police said a tool had been used to cut an opening in its fencing.

Please use Chrome browser for a more accessible video player

A similar opening was found in an enclosure of langur monkeys, though none got out.

Six dead after World War Two planes collide at Dallas airshow

A week later, an endangered vulture called Pin was found dead, with the zoo saying the death did not appear to be natural.

Gregg Hudson, the zoo’s chief executive, said the vulture was found with a wound.

Ed Hansen, chief executive of the American Association of Zoo Keepers, said he could not recall a zoo that had dealt with so many similar incidents with such frequency.

“It appears that somebody really has an issue with the Dallas Zoo,” he said.

Mr Hansen described Dallas Zoo’s reputation as “excellent” within the industry, adding that accredited zoos had double-perimeter fencing and that a zoo as large as Dallas’ would have a security patrol.

Dallas Zoo said in a statement that it had added additional cameras and increased overnight security patrols.

It also said the two missing emperor tamarin monkeys would most likely stay near their habitat, but that a search of the zoo grounds had failed to find them.

Animals have previously escaped enclosures from Dallas Zoo, with a 340-pound (154kg) gorilla named Jabari jumping over a wall in 2004.

He went on a 40-minute rampage that injured three people before being shot and killed by police.

Related posts:

Tiger Woods driving at ‘excessive speed’ at time of serious car crash, police say Amazon offers to pay college fees for 750,000 workers in battle for staff Man who planted razor blades in pizza dough at supermarkets jailed US DoJ urges court to investigate Maxwell juror who was ‘victim of sexual abuse’ Three white men who chased and shot black man out running sentenced to life in prison US abortion debate promises a noisy and divisive road ahead Buffalo shooting ‘carried out by sick, demented individual fuelled by diet of hate’ who is now on suicide watch Elon Musk subpoenas former Twitter chief executive Jack Dorsey Donald Trump lawyers move to halt FBI review of Mar-a-Lago classified documents Boy, 6, who shot teacher used mother’s gun – as police reveal more details of shooting Harry says ‘dangerous lie’ told about his book – and claims Taliban remarks were taken out of context American football player Damar Hamlin who suffered cardiac arrest mid-game is released from hospital