The UN inspectors have left Syria, but an indictment against Assad may be on its way from a different direction before the results of their investigation are finalized: IsraelDefense.com: Syrian Forensic Chief Defects with Evidence of Chemical Weapon Use.

The Syrian opposition has stated today (Tuesday) that Abdul Tawwab Shahrour, head of the forensic medicine committee in Aleppo, has defected to Turkey.

According to Syrian opposition representatives, Shahrour is in possession of evidence pointing to the use of chemical weapons by the Bashar al-Assad regime in an attack that occurred earlier this year. More than 20 people were killed in an attack at the Khan al-Assal district near Aleppo on March 19. The Assad regime has previously denied allegations that it used chemical weapons during the attack.

According to the Syrian opposition, Shahrour has both documents and eyewitness accounts proving the use of chemical weapons during the events and contradicting the Assad regime’s version of the attack, which he intends to reveal at a news conference.