A Clackamas man Thursday pleaded guilty to placing calls to two airports in Nevada and Texas, reporting his father and brother as terrorists because they got an invitation to a family wedding and he didn't.

Sonny Donnie Smith, 38, admitted to placing anonymous phone calls to security offices at McCarran International Airport in Las Vegas and the Midland International Air and Space Port in Midland, Texas.

He falsely claimed that his father and brother were terrorists traveling through the airports, according to prosecutors.

Both calls were made Sept. 3, 2016, Assistant U.S. Attorney Hannah Horsley said.

The calls prompted an FBI investigation that revealed no terrorist threats. Smith's father and brother were temporarily detained and questioned by investigators as a result, and the brother missed his flight that day.

The calls resulted from a family feud, according to court documents. Sonny Smith made the threatening calls because he was told he wasn't welcome at a family wedding they were heading to, according to the plea agreement.

"Thanks to the FBI agents and partner agencies who worked this case, Mr. Smith quickly found his harassment was far from anonymous,'' said Loren Cannon, Oregon's FBI special agent in charge.

Smith faces a maximum sentence of two years in prison, a $250,000 fine and one year of supervised release. He's set to be sentenced May 10.

"The safety and security of our nation's airports and travelers are of paramount importance to law enforcement, and we will continue to swiftly and thoroughly investigate all threats of terrorism,'' said Billy J. Williams, Oregon's U.S. Attorney.

-- Maxine Bernstein

mbernstein@oregonian.com

503-221-8212

@maxoregonian