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No bombs were found on two airplanes forced to land in Atlanta after online threats prompted a security scare Saturday. Hartsfield-Jackson Atlanta International Airport announced the all-clear at 3:20 p.m., about 90 minutes after the jets landed there.

NORAD fighter jets escorted the two commercial planes to the airport, an airport spokesman said. The airlines received the bomb threats via Twitter.

Both Delta Flight 1156, arriving from Portland, Oregon, and Southwest Flight 2492, from Milwaukee, landed safely at the airport at 1:45 p.m. ET, airport spokesman Reese McCranie said in a statement. The planes were evacuated and were inspected by bomb squads and canine units.

"Due a security situation, the aircraft operating Flight 2492 was taken to a remote area of the airport where Customers and the aircraft are being rescreened," Southwest Airlines said in a statement. "Our number one priority is the Safety of our Customers and People. We cannot comment on the nature of the security situation."

Passengers are evacuated from Delta Flight Flight 1156 at Hartsfield-Jackson International Airport after a a bomb threat on Jan. 24. Courtesy Ashley Askew

SOCIAL

All clear for both aircraft & normal airport operations have resumed. Thank you for your patience. Safety & security are our top priorities. — Atlanta Airport (@Atlanta_Airport) January 24, 2015

Emergency vehicles responding to bomb threats at Hartsfield-Jackson. More: http://t.co/Zlg5dc7abJ pic.twitter.com/lxJJG5qUw4 — 11Alive News (@11AliveNews) January 24, 2015

— Kyle Scott, Chris Essner and Daniella Silva