On Tuesday, Lebanese media reported the capture and detention of a woman and child believed to be the wife and young son of Islamic State leader Abu Bakr al-Baghdadi.

“Military intelligence detained one of his wives, who was traveling with their son, near (Lebanese border town) Arsal 10 days ago,” a security source told AFP.

According to conservative interpretations of Islamic law, a man may marry up to four wives. Tribal sources in Iraq told The Guardian  that al-Baghdadi has three wives. Al-Baghdadi proclaimed himself Caliph of the IS-declared “Islamic Caliphate” whose territory stretches across large areas of Iraq and Syria.

The Syrian woman in Lebanese custody was travelling with her 10-year-old son, carrying false identification papers, when they were detained. Lebanese daily As-Safir, which broke the story, said the arrest was carried out ten days ago, “in coordination with foreign intelligence agencies.”

According to the Jerusalem Post, the woman may be used as a bargaining chip by Lebanon. Currently, 20 Lebanese soldiers and policemen are being held hostage by IS and al-Qaeda’s Syrian branch, the Nusra Front. They have been held since August. On Monday, Nusra Front threatened to kill one of the hostages.

The woman is being interrogated by Lebanese authorities, under the supervision of military prosecutor Saqr Saqr, and DNA tests are being conducted to verify the identity of the child.

Al-Baghdadi is on the US terrorist watch list and has a $10 million bounty on his head. After being reported dead or at least injured in a US airstrike last month, an audio message from the reclusive leader was released in which he said his forces would continue to fight to the last man. His medical status and current whereabouts are unknown.