NEW ORLEANS - The head of The FBI office in New Orleans is joining city and state officials in asking for public vigilance during Mardi Gras season.

FBI agent Jeff Sallet and Mayor Mitch Landrieu stressed that there is no credible threat to Mardi Gras festivities. But they stressed that residents and visitors should be alert for -- and report -- anything they deem suspicious.

They plan to publicize a toll free number, 1-800-CALL-FBI, as part of the "If you see something, say something campaign.

Carnival season draws an estimated 1 million people to area streets for parades and celebrations that continue until Mardi Gras, which falls this year on Feb. 9.