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 (sah-LEHT) 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.