No dangerous device was found at the Cincinnati Zoo Thursday after someone called police with a threat, Cincinnati police said.Cincinnati police officers and bomb-sniffing dogs searched the zoo after the call, which came in at 3 p.m. Police completed their search at around 5 p.m.About 50 guests were evacuated immediately.Police are working to trace the call and are said that the caller could face criminal charges.Watch the latest reportThe police department tweeted about the evacuation: "Cincinnati Zoo evacuated for suspicious device call. Bomb dogs currently sweeping zoo. Media staging area: Vine & Shields bus turn-around."CPD Zoo evacuation tweet"The Cincinnati Zoo & Botanical Garden safely evacuated staff and guests today around 3:30 pm as a precaution after an unspecified threat was called into Cincinnati Police," the zoo wrote in a statement. "The Zoo takes all threats seriously. We will continue to work with Cincinnati Police to ensure the Zoo remains a safe environment."The Cincinnati Zoo has been under fire, especially on social media, since Haramabe, a gorilla, was shot and killed there in May after a child got into his enclosure. Police would not comment on whether Thursday's incident was related to Harambe's death.The zoo expects to open as normal Friday.Watch the full news briefing

No dangerous device was found at the Cincinnati Zoo Thursday after someone called police with a threat, Cincinnati police said.

Cincinnati police officers and bomb-sniffing dogs searched the zoo after the call, which came in at 3 p.m. Police completed their search at around 5 p.m.

About 50 guests were evacuated immediately.

Police are working to trace the call and are said that the caller could face criminal charges.

Watch the latest report

The police department tweeted about the evacuation: "Cincinnati Zoo evacuated for suspicious device call. Bomb dogs currently sweeping zoo. Media staging area: Vine & Shields bus turn-around."

"The Cincinnati Zoo & Botanical Garden safely evacuated staff and guests today around 3:30 pm as a precaution after an unspecified threat was called into Cincinnati Police," the zoo wrote in a statement. "The Zoo takes all threats seriously. We will continue to work with Cincinnati Police to ensure the Zoo remains a safe environment."

The Cincinnati Zoo has been under fire, especially on social media, since Haramabe, a gorilla, was shot and killed there in May after a child got into his enclosure. Police would not comment on whether Thursday's incident was related to Harambe's death.

The zoo expects to open as normal Friday.

Watch the full news briefing