Police discovered 15 assault rifles, 10 semi-automatic pistols and about 10,000 bullets in this 18-year-old man.

Twenty-five firearms and about 10,000 bullets were found in Ohio, in the northeastern United States, in an 18-year-old man arrested for calling online to kill police, the FBI said.

On the iFunny internet forum, where he had some 4,400 subscribers, the young man had published messages advocating mass killings, calling for attacking family planning centers and "shooting at sight". all federal agents, "according to an FBI complaint filed against him on Monday.

"Only a joke"

In raiding his home in Boardman, eastern Ohio, police discovered 15 assault rifles and 10 semi-automatic pistols, ammunition and camouflage uniforms. The suspect admitted to publishing the threatening comments on the internet but said it was "just a joke".

Two assault rifle massacres in the United States killed 22 people on August 3 in El Paso, Texas, and 9 were killed in Dayton, Ohio.