Maui police said the Kahului airport’s Emergency Operation Center received a call threatening harm to an outbound flight Tuesday morning.

Police said that the call came in at 9:44 a.m.

Authorities declined to say which airline was involved, but sources said it was an Alaska Airlines flight departing Maui for the mainland.

Police do not know who made the call, but are trying to trace it, said Lt. William Juan, spokesman for the Maui Police Department.

Police, the FBI and TSA agents checked the plane and screened passengers and baggage multiple times and determined that it was safe, said the Department of Transportation and police spokesmen.

Transportation Department spokesman Tim Sakahara said the FBI’s bomb-sniffing dogs were used to check the area, The plane, the passengers and baggage were screened multiple times.

The flight was delayed a little less than two hours, Sakahara said.

Maui police have opened a first-degree terroristic threatening case.