The U.S. official overseeing contacts to secure a ceasefire between Israel and the Iran-backed Hezbollah in Lebanon is due to visit Beirut on Tuesday, sources in Lebanon said on Monday, with Beirut expected give its response to a U.

Lebanon's health ministry said Israel struck a densely packed Beirut neighbourhood on Monday, killing at least four people, in the third attack in two days on the city's central districts.Several hundreds of metres (yards) away was the site of a similar strike on Sunday,

The latest in a series of targeted killings of senior Hezbollah officials came as Lebanese officials were considering a United States-led cease-fire proposal.