The Transportation Security Administration (Tsa) plans to add 150 new body scanners to strengthen security across all US airports, despite criticism from the government and other organisations.

The preliminary screening device will use low-intensity X-rays for screening passenger clothing to detect weapons and explosives, eliminating the need to go through a metal detector.

TSA has purchased the new body scanners using $25m in stimulus funds.

Salt Lake International Airport in US has already been fitted with the new devices, which use millimeter technology.