The FBI says it's investigating a package at New York City's John F. Kennedy International Airport "out of an abundance of caution."

FBI spokesman Richard Kolko said Wednesday night the agency and police hadn't determined what was in the package.

The FBI hasn't released details on where the package was discovered or when.

The Port Authority of New York and New Jersey manages the airport. It hasn't returned a telephone call seeking comment.

The Queens airport is one of the busiest in the nation. It served nearly 46 million people in the last year.