An Israeli airstrike in the Gaza Strip has killed an Islamic Jihad militant and wounded three others as they were preparing to fire rockets into southern Israel.

Gaza Health Ministry spokesman Adham Abu Salmia says they were hit by shrapnel in Saturday night's attack.

Islamic Jihad says the men were members of the group, which also fired rockets into Israel a week earlier, killing one civilian and injuring others. That rocket attack also triggered Israeli strikes that killed several militants.

Israel's military confirmed it hit militants preparing to fire rockets on Saturday.

Gaza militants have fired thousands of rockets at Israel in the past decade. About 1 million Israelis live within range of the Gaza rocket fire.