Marks and Spencer's bras are apparently setting off security scanners at airports.
Women have complained on Twitter about being searched.
luton airport security searched me rather carefully as my bra made a 'significant bleep'. M&S bras seem to be the cause!— sarah chapman (@sarahjchapman) August 29, 2013
Ha! I just got taken away by Heathrow Airport security police! "Mam, you're bleeping all over." Turns out M&S (not S&M) bras set them off?!— Rebecca Jones (@TheRebeccaJones) July 27, 2011
It has claimed there is a special metal in M&S bras that other retailers do not use.
The company, which sells 23m bras a year says it is investigating the problem and has tweeted to say it's "on a mission to get this fixed".
Women are now warning other holiday makers not to wear M&S bras while travelling.