Police probe threat that led to evacuation of Cincinnati Zoo

Cincinnati Zoo & Botanical Garden's employees stand in a nearby parking lot after the park was evacuated after a report of a suspicious package, Thursday, Sept. 8, 2016, in Cincinnati. (AP Photo/John Minchillo) (The Associated Press)

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Cincinnati Zoo & Botanical Garden's employees return to work after gathering with authorities in a nearby parking lot after the park was evacuated after a report of a suspicious package, Thursday, Sept. 8, 2016, in Cincinnati. (AP Photo/John Minchillo) (The Associated Press)

Cincinnati Zoo & Botanical Garden's employees meet with authorities in a nearby parking lot after the park was evacuated after a report of a suspicious package, Thursday, Sept. 8, 2016, in Cincinnati. (AP Photo/John Minchillo) (The Associated Press)

CINCINNATI – Police in Ohio are investigating after receiving a threatening call that prompted the evacuation of the Cincinnati Zoo.

A sweep by bomb sniffing dogs found nothing suspicious at the zoo on Thursday afternoon.

Cincinnati police say about 50 visitors and 75 employees were evacuated after police received the call around 3 p.m. Police declined to comment on what the caller said.

The zoo has been the target of critics on social media and elsewhere after a lowland gorilla named Harambe (huh-RAHM'-bay) was shot and killed by the zoo's special response team in May when a 3-year-old boy fell 15 feet into a moat inside the gorilla enclosure.

The gorilla exhibit reopened in June with a higher, reinforced barrier.