Experts from the United Nations have sent state-of-the-art detection equipment to Brazil over fears suicidal terror nuts will target the Olympics with a devastating ‘dirty bomb’.

The International Atomic Energy Agency (IAEA) has loaned hi-tech radiation monitors – including personal detectors and portable scanners – for use on the ground throughout the Games.

Brazil’s anti-terror chief has already admitted there is a ‘credible threat’ ISIS will target Rio next month and said ‘numerous measures’ are being taken to prevent any attack.

Counter-terrorism director Luiz Alberto Sallaberry said the threat had increased dramatically in recent months due to attacks across Europe.