The Israeli army officials estimated that air raid sirens sounded in north Israel yesterday morning were caused by malfunctioning radar, local newspaper Yedioth Ahronoth reported.

Air raid sirens sounded across Kiryat Shmona, Hatzor Haglilit, Safed and Rosh Pina, driving alarmed residents rush into shelters in north Israel Thursday morning for the first time after a cease-fire took effect.

In responds to the sirens, the army officials said that there were no reports of rockets landing in the north and the sirens were caused by malfunctioning radar.

They said that the siren in the Upper Galilee was activated following army radar activity that was apparently set off by mistake.

The Israel Defense Forces (IDF) is currently looking into the incident, the army was quoted as reporting.

On Monday, the Home Front Command informed local residents return to routine life, although public gatherings are still prohibited in the region.

Both Hezbollah and the IDF have refrained from aerial attacks since the UN-brokered cease-fire went into effect Monday morning.

The Haifa port resumed functioning on Thursday and residents flocked back to their homes in the north.

Hezbollah fired nearly 4,000 rockets at Israel during the month-long fighting, said the report.