Bomb Threat At Paul Vs. Woodley Fight, Caller Said 17 Devices Planted

An hour before Jake Paul and Tyron Woodley took the ring Sunday night, a man contacted police and said he planted 17 bombs around the arena and was going to blow the place up, TMZ Sports has learned.

According to a police incident report, cops got a call from a person claiming to be from Afghanistan around 10:15 PM ... stating he placed pipe bombs underneath the stage, in the bathrooms and under seats at Rocket Mortgage FieldHouse in Cleveland, where the fight went down.

The man -- who said the bombs were going to go off in minutes -- told cops he was targeting non-believers, who he believed should be killed. He told police Paul was a non-believer.

The caller stated he planted the devices 1.5 hours before the event started.

At one point, the caller told authorities they should evacuate the arena ... as the bombs were about to detonate.

FYI, there were reportedly about 16,000 fans in the buiilding.

Police dispatched the bomb unit -- including a bomb sniffing K9 -- and swept the building.

Thankfully, it seems it was an empty threat or terrible prank ... 'cause no explosive devices were located.

A police spokesperson told us no arrests have been made ... and the investigation is ongoing.