Stepping through the charred ruins of her neighbourhood in central Beirut, Lebanese seamstress Laila Amayrad watched bulldozers pick through a building flattened by an Israeli strike days ago, hoping her friends' bodies would be found.

Israel's military once again bombed buildings near the Lebanese capital Beirut on Sunday, a day after one of its strikes on a densely populated area in central Beirut killed at least 29 people, according to the latest tally from Lebanon's Health Ministry.

Dozens of people have been killed by Israeli strikes in Lebanon, including 20 who died after a strike flattened a multi-story residential building in central Beirut overnight, according to Lebanese officials.