JERUSALEM (JTA) — Israel’s Air Force killed members of an Islamic State cell after gunshots and mortars were fired at Israeli troops on the border with Syria.

The Israel Defense Forces confirmed that its soldiers were conducting an operation in the Golan Heights, in which they passed the security fence with Syria while remaining in Israeli territory. They then came under attack with machine gun fire. The soldiers returned fire.

No injuries to Israeli soldiers were reported.

It is not known if the mortar shells landed in Israeli or Syrian territory.

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The Air Force launched a retaliatory attack within minutes of the gun fire. Pilots reported the death of the four ISIS cell members.

It is reportedly the first conflict between Israel and the Islamic State. Most previous attacks on Israel from Syria have been accidental spillover from the internal fighting. The IDF has responded to those with return fire.

“The army will not tolerate any attack on its sovereignty and will respond severely to any attempt to violate it,” the army said in a statement.

The mortar and gun fire toward Israel comes amid renewed fighting in the area between rebel forces and the army of Syrian President Bashar Assad in a more than five-year civil war.

בתגובה לירי לעבר כוחותינו ברמה״ג השיב כוח צה”ל באש ותקף חוליית מחבלים המשתייכים לארגון המדינה האיסלאמית

— צבא ההגנה לישראל (@idfonline) November 27, 2016