A TERRORIST involved in the Paris attacks posted an Islamic State flag on his Facebook page three weeks before the massacre – but Belgian security officials ignored it.

The shocking oversight is yet another example of the blunders that allowed the killers to murder 130 in the French capital, and then a further 32 in Brussels.

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Salah Abdeslam, a 26-year-old Frenchman who was brought up in Belgium, was part of the gang, and is currently awaiting trial in Paris.

According to a leaked parliamentary report, he posted an image of the Isis flag in October last year, but the clue led to no action whatsoever.

RTBF, Belgium’s national broadcaster, said this came at a time when Abdeslam was known to be in regular contact with Abdelhamid Abaaoud, the on-the-ground ringleader of the attacks.

Both men were brought up in the Molenbeek district of Brussels, and had regularly been in trouble with the law.

But the overworked and understaffed Belgian security services ‘found it impossible to cope,’ said a source close to the French enquiry into the attacks.

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He added: ‘Information about the flag on Facebook was passed on by an informer in Molenbeek, but it was ignored.’

The enquiry has already heard how Belgian police abandoned surveillance of Salah Abdeslam and his brother, Brahim, six months before the attacks.

Brahim ended up killing himself by detonating an explosive device in a Paris café on November 13th.

Salah Abdeslam, meanwhile, abandoned his own suicide mission at the Stade de France, and escaped back to Brussels, where he was finally caught after being shot in the leg in March.

Abdeslam is known to have hired cars and hotel rooms before the attacks in his own name, but denies killing anyone directly.

He faces life in prison following a trial which should take place some time in 2017.