According to Israel's military, "precise attacks" are being carried out in Dahieh, the densely populated suburb of Beirut that has been subjected to extensive Israeli attacks recently and where the Shia militia Hezbollah has a strong presence.
In the same area, Hezbollah's leader Hassan Nasrallah was killed during extensive bombing on Friday evening.
Sources, including the AFP news agency, report that a warehouse located near Lebanon's only international airport was hit by an Israeli attack.
At the same time on Saturday, sirens sounded over central Israel. According to Israel's military, this was after a rocket was fired from Yemen. However, the rocket was shot down outside the country's borders, the military reports.
Hezbollah has also carried out attacks during the day. According to Israeli reports, up to a hundred rockets have been fired at mainly northern Israel, but also more central parts of the country, from Lebanon.