An incoming rocket alert siren sounded in the central Negev, in communities near the Sinai border, on Tuesday morning, though there were no immediate reports of an impact, the army said.
The Israel Defense Forces launched a search in the area to determine if a rocket had landed in Israeli territory. No projectile was initially found.
The siren went off just after 8 a.m., in Revivim, Ezuz, Nitzana and other communities near the Egyptian border.
It appeared as though the alert system was triggered by a launch from the Sinai Peninsula that landed inside Egypt.
However, it was not clear if Israel was the target or if the system was triggered by internal fighting between Egyptian troops and an Islamic-State-affiliated terrorist group in the area.