Abu Bakr al-Baghdadi
Abu Bakr al-BaghdadiReuters

Banknotes printed to look like $100 bills with Arabic on them and the picture of Islamic State (ISIS) leader Abu Bakr al-Baghdadi were found Tuesday morning at several Jewish towns in northern Israel, after being apparently placed by pro-ISIS Arab citizens.

The ISIS bills were discovered at Yesud Hama'ala, Hulata, and even at the entrance to a kindergarten in the moshav Sde Eliezer in the Upper Galilee, reports Walla.

Police have launched and investigation into the incident, with the bills being sent to a laboratory for inspection.

Yoram Makhlof, security officer of the Mevo'ot Hermon Regional Council that includes Sde Eliezer, told the news site that security forces were dispatched after the notes were found.

"This morning residents from the moshav Sde Eliezer were surprised to find at the entrance to a kindergarten bills modeled after $100, with a picture of the ISIS leader Abu Bakr al-Baghdadi and writing in Arabic on them," said Makhlof.

"I didn't take the matter lightly and called out all the relevant emergency sources in the Council," said the security officer. "In order to raise the feeling of security for the residents, our communal officer also arrived, and conducted patrols at the site."

"Police forces, the community security coordinator of the town, and our communal officer are conducting searches in the town and checking all workers who are there and are not residents of the moshav Sde Eliezer," he said, apparently referring to Arab workers. "This is a mystery that certainly raises concerns for us."

Al-Baghdadi released an audio recording just this Saturday threatening Israel, with experts saying the main danger is from ISIS sympathizers among the Arab public in Israel.

A poll last month found that 18.2% of Arab Muslim citizens of Israel do not consider ISIS to be a radical terrorist organization, and that they are not ashamed of the brutal jihadist group. That figure jumped to 28.1% among Arab citizens who are supporters of the radical Islamic Movement in Israel.