The Israeli military pounded Beirut's southern suburbs with airstrikes on Tuesday, mounting one of its heaviest daytime attacks yet on the Hezbollah-controlled area after the defence minister ruled out a ceasefire until Israeli goals were met.

The new bombardment on both fronts comes on the verge of a deadline set by the United States for Israel to dramatically ramp up humanitarian aid allowed in Gaza or risk possible restrictions on US military funding.

A Lebanese security official said an Israeli strike hit a villa east of Beirut on Tuesday, with state media confirming the rare attack outside Hezbollah's traditional strongholds.