Report: Officials knew Salah Abdeslam posted Islamic State flag online but did nothing

BRUSSELS, May 17 (UPI) -- Salah Abdeslam, the only suspect to survive the November attacks in Paris, reportedly posted a flag of the Islamic State on his Facebook page shortly before the massacre.

Security officials in Belgium's Coordinating Unit for Threat Analysis were aware of the flag being posted on Oct. 23, but did not respond, Belgian news website RTBF reported.

Abdeslam, 26, from Belgium, was arrested before the Brussels bombings took place on March 22, when 32 people were killed. He is considered to be the sole-surviving suspect of the Nov. 13 Paris attacks, in which 130 people were killed in coordinated bombings and shootings. Both attacks were claimed by the Islamic State.

Belgian authorities have previously admitted to key errors in the months leading up to the attacks, including the miscommunication of intelligence between security teams during the manhunt for Abdeslam.

Abdeslam was extradited to France in late April. He is being held in a high-security jail outside of Paris while investigations continue on terror charges of murder and attempted murder.