DANVILLE, Pa. —

       Residents of a Pennsylvania county were warned Saturday not to approach a monkey that was missing after a crash involving a pickup truck that was towing a trailer taking about 100 of the animals to a lab.

       State troopers urged people not to look for or capture the cynomolgus macaque monkey following the Friday afternoon crash on state Route 54 near an Interstate 80 exit in Montour County.

       “Anyone who sees or locates the monkey is asked not to approach, attempt to catch, or come in contact with the monkey. Please call 911 immediately,” troopers tweeted, not elaborating on any specific dangers the monkey posed.

       Several monkeys escaped after the collision between the pickup and a dump truck, but as of Saturday morning only one remained unaccounted for, officials said. The Pennsylvania Game Commission and other agencies searched for it amid frigid weather.

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       The U.S. Centers for Disease Control and Prevention said the agency was providing “technical assistance” to state police. The shipment of monkeys was en route to a CDC-approved quarantine facility after arriving Friday morning at New York’s Kennedy Airport from Mauritius, the agency said.

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       The truck had been on its way to a lab, Trooper Andrea Pelachick told The Daily Item newspaper of Sunbury.

       The location of the lab and the type of research for which the monkeys were destined weren’t clear, but cynomolgus monkeys are often used in medical studies. A 2015 paper posted on the website of the National Center for Biotechnology Information referred to them as the most widely used primate in preclinical toxicology studies.

       Trooper Lauren Lesher said state police secured the scene for the Pennsylvania Department of Health and the CDC.

       The conditions and whereabouts of the remaining monkeys weren’t clear Saturday. There was also no information available on the conditions of the motorists or whether any citations were issued.

       A crash witness, Michelle Fallon, told the Press Enterprise newspaper of Bloomsburg, Pa., that she spoke with the pickup driver and a passenger after the crash. The driver appeared to be disoriented, and the passenger thought he might have injured his legs, she said.

       Crates littered the road Friday as troopers carrying rifles searched for monkeys. Valley Township firefighters used thermal imaging to try to locate the animals, and a helicopter also assisted, the Press Enterprise reported.

       The pickup was heading west on I-80 when it got off at the Danville exit and then immediately tried to get back on, driving across the other lane, the newspaper reported.

       Fallon told the Press Enterprise that she was behind the pickup when it was hit on the passenger’s side by the dump truck, tearing off the front panel of the trailer and sending more than a dozen crates tumbling out.

       She and another motorist who stopped to help were standing near the scene when the other driver said he thought he saw a cat run across the road, Fallon said.

       Fallon peeked into a crate and saw a small monkey looking back at her, she told the newspaper.

       “They’re monkeys,” she told the other motorist.