Heathrow Airport is on high terror alert amid fears female terrorists might use breast implants as bombs, it emerged today.

Experts believe there is a 'credible' threat that al-Qaida could target flights out of London using explosives hidden in the chests of its operatives.

Specialists believe women could have had breast surgery with implants which, if injected with another liquid, will cause a large enough explosion to take down a plane.

Sources have said that security at Heathrow is taking longer as they check busts.

'There are genuine fears over this,' a member of staff told the Daily Mirror.

'We have been told to pay particular attention to females who may have concealed hidden explosives in their breasts.

'This is particularly difficult for us to pick up but we are on a very high state of alert. It’s led to long queues here at Heathrow – much longer than usual at this time of the year.'

Terrorism expert Andy Oppenheimer added: 'There is a great fear that al-Qaeda are planning on using internal devices to try to get through airport scanners. These explosives could be in breast implants.'

Government sources have admitted they are aware of the breast implant threat but Heathrow and the Department for Transport said they would not comment on specifics.

A spokesman for the DfT said: 'The safety of the travelling public is paramount, which is why the UK combines technology, intelligence and other measures to provide one of the strictest aviation security regimes in the world.

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