Law enforcement and hazmat officials in New Jersey are investigating three Super Bowl-area hotels after reports of a suspicious white powder found on the premises.

Hazardous materials teams and a bomb squad responded Friday after white powder was found at three hotels near the East Rutherford, N.J., site of the Super Bowl, New Jersey authorities said, CNN reported.

In New York, authorities also were investigating the contents of a letter sent to the Manhattan office of former Mayor Rudy Giuliani, two law enforcement officials said. A letter opened in the mailroom contained white powder, according to officials.