At least 23 people have been killed in Israeli air strikes on two houses in central Lebanon where displaced families were reportedly living, the Lebanese health ministry says.

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, and struck the middle of the country where more than 20 people were killed.

The Israel Defense Forces continued its intense airstrike and ground campaigns in Gaza -- particularly in the north of the strip -- and in Lebanon, with Israeli attacks on targets nationwide including in the capital Beirut.