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Multiple missiles were fired in an airstrike towards a densely populated part of Lebanon's capital early on Saturday.

The huge airstrike targeted Beirut's Basta neighbourhood, and no prior warnings were given by the Israeli military. The largely residential area was struck last month.

At least one violent explosion was heard across the city, Reuters witnesses said, and could be seen.  at the site were shared online, including .

"Beirut, the capital, woke up to a horrific massacre, as the Israeli enemy's air force completely destroyed an eight-story residential building with five missiles on Al-Mamoun Street in Basta," the state-run National News Agency reported.

The health ministry put the initial death toll at four, with 23 wounded. The number is expected to climb in the coming hours as search and rescue efforts continue.

It came after a long day of Israeli airstrikes on Beirut's southern suburbs, which have been non-stop since last week.

The cross-border fighting between Israel and the Iran-backed Hezbollah militant group escalated into a full-blown war in mid-September.

Israel has bombed southern Lebanon, Beirut's southern suburbs and the eastern Beqaa region, and has sent ground troops across the border. Hezbollah has continued to fire rockets deeper into Israel.