According to the Jerusalem Post, websites “known to be close” to ISIS extremists reported the capture of the Israeli-Canadian woman, who joined Kurdish fighters overseas, on Sunday.

“Canada is pursuing all appropriate channels” to seek further information and is in touch with local authorities, a spokesman for the foreign ministry said on Sunday.

The newspaper said the websites give few details on the alleged capture, only that it occurred after three suicide attacks on sites where Kurdish fighters were holed up.

The reports have not been confirmed by Israeli officials.

“I cannot confirm that and I hope that it isn’t true,” Israeli Defence Minister Moshe Ya’alon told an Israeli television channel when asked about the reports.

Rosenberg, 31, told Reuters that she was in Syria in November. A source linked to the YPG, the Kurds’ dominant fighting force in northern Syria, said earlier this month that she was their first female foreign recruit and had crossed into Syria to fight Islamic State militants.

Clashes between ISIS and Kurdish troops have largely focused on the Syrian city of Kobani, near the Turkish border.

The now-notorious al-Qaeda splinter group is currently in control of large swaths of territory in both Syria and Iraq.

Messages of concern were posted Sunday on a Facebook profile belonging to a Gill Rosenberg. An earlier message asked for advice on joining the Kurdish army.