NEW YORK — NFL fans are undergoing more extensive pat-downs from security guards before being allowed into stadiums, although the new measure did not prevent a man from using a stun gun at a game last Sunday.

The league has asked all 32 clubs to have security guards search fans from their knees to their ankles. Pat-downs for such items as alcohol and weapons were previously done only from the waist and above.

An NFL spokesman said the measure began with last week's season openers and was not done in response to a specific threat.

The tightened security will cause longer delays at stadium entrances and spectators are asked to allow extra time and arrive earlier as a result.

Last Sunday, a man was arrested after using a stunner device at a game in New York between the host Jets and Dallas Cowboys.