Law enforcement officials found no bombs on two planes at Atlanta's main airport after authorities received what they considered credible threats, FBI spokesman Stephen Emmett said.

The threats were originally posted to Twitter by @kingZortic. At about 3:51 p.m. the account, which had earlier challenged the FBI, CIA and NSA, posted an address on the 4500 block of West Schubert Avenue in Chicago and issued another challenge to "come get me I got guns, COME AT ME."

Chicago Police went to the address listed on social media and determined that the person behind the threats did not actually reside at that address, said News Affairs Officer Bari Lemmon. Police did not find any weapons and did not arrest or detain anyone, Lemmon said.

The threats targeted Southwest Airlines Flight 2492, which arrived at Atlanta from Milwaukee, and Delta Air Lines Flight 1156, which arrived from Portland, Oregon, said Reese McCranie, a spokesman for Hartsfield-Jackson Atlanta International Airport. Both planes landed safely.

The passengers were taken off the aircraft, and police bomb and K-9 teams examined both planes, authorities said.

Preston Schlachter, a spokesman for the North American Aerospace Defense Command, said that after being alerted to the Twitter threats, military officials sent two F-16 fighter jets from a base in South Carolina to escort the commercial aircraft to Atlanta.

Upon landing, the Southwest Airlines flight taxied to a remote area where the passengers and the aircraft were rescreened, company officials said in a statement.

"Our top priority is the safety of our customers and employees," Southwest officials said. "We cannot comment on the nature of the security situation."

David Goldman / AP Passengers leave a fire station as they board a shuttle taking them off the tarmac at Hartsfield-Jackson Atlanta International Airport where two airplanes were being searched on Jan. 24, 2015, in Atlanta. Passengers leave a fire station as they board a shuttle taking them off the tarmac at Hartsfield-Jackson Atlanta International Airport where two airplanes were being searched on Jan. 24, 2015, in Atlanta. (David Goldman / AP)

Associated Press