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Brussels bombing suspect let go as new 'man in hat' CCTV footage released

Belgian police have released a man that they had initially charged with "participation in a terrorist group" and "terrorist killings" in connection with the Brussels attacks on the same day that they revealed new CCTV footage of another suspect.

Faycal C, who was the only person charged in connection with last week's attacks, was released due to "lack of evidence", prosecutors said.

It comes as US Republican presidential frontrunner Donald Trump warned Britain and Europe are "not safe" following the recent terror attacks.

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Brussels bombers brothers 'spied on nuclear researcher'

Khalid and Ibrahim El Bakraoui reportedly spied on a top nuclear researcher.

Brussels bombers Khalid and Ibrahim El Bakraoui planted a hidden camera to spy on a top nuclear researcher and hoped to build a "dirty bomb", according to reports.

An expert involved in a probe into Islamic State threats told NBC News that the brothers filmed more than 10 hours of footage of a senior researcher at a Belgian nuclear centre and his family.

The footage was seized during a Belgian raid in November, officials confirmed.

Former intelligence official Claude Moniquet, who was hired to investigate potential plots targeting the Europe's nuclear sector said: "The terrorist cell naively believed they could use him to penetrate a lab to obtain nuclear material to make a dirty bomb."

While the plot did not happen, he said the brothers then set up the camera to spy on the nuclear expert, confirmed as a "top researcher" by Belgium's Federal Agency for Nuclear Control.

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