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KANSAS CITY, Mo. — Flights are on time and passengers have been allowed back in after a late-night bomb threat at KCI Airport Sunday.

Airport police evacuated Terminal B around 10:30 p.m.

People were allowed back into Terminal B, which is where Southwest flies out of, about 45 minutes later.

An airport spokesperson told FOX 4 that the evacuation was a part of security protocol.

So far no other details have been released.