Police are searching two planes at Atlanta's main airport after authorities received what they described as credible bomb threats.

Hartsfield-Jackson Atlanta International Airport spokesman Reese McCranie said the threats targeted a Delta flight and a Southwest flight that landed safely Saturday.

McCranie said he did not have additional details about the nature of the threats, though he described them as "credible."

A bomb squad and dog unit from the Atlanta Police Department were going to search both aircraft.