A mortar shell exploded in the Golan Heights Friday night, in what authorities believed was a stray from fighting across the border in Syria between rebel groups and government troops.
There were no immediate reports of injuries or damage.
Last week, several mortar shells exploded in an open area in the Golan Heights, also apparently the result of inadvertent spillover from fighting in Syria, according to the IDF.
Israel responded by firing a Tamuz missile at the origin of the attack. An IDF spokesperson said the strike was successful.
Artillery from Syria has landed frequently on the Israeli side of the Golan Heights for the past few weeks as regime and rebel forces fight over the Quneitra crossing.
On Thursday, sirens signaling a rocket attack blared in the upper Galilee on Thursday night in an apparent false alarm.
The communities of Kfar Giladi, Beit Hillel, Metula, Manara and Kiryat Shmona were on alert after the siren was unexpectedly set off, according to news site Walla. There were no confirmed reports of rocket fire in the area and it remains unclear what set off the sirens.
The incident came after a series of rocket and mortar attacks over the past weeks from terrorists operating in both Syria and Lebanon.
Three weeks ago the region was targeted by two rockets that originated from Lebanon. The IDF responded with artillery fire. There were no reported casualties on either side.
The northern Galilee is currently out of range for terrorist groups operating in the Gaza Strip and was largely unaffected by the most recent conflict between Israel and Hamas.
The area was heavily targeted by Hezbollah in the Second Lebanon War in 2006, a conflict that killed 44 Israeli civilians and left over 1,500 injured.