Israel has launched a strike on Beirut for the second time in days, further testing the shaky ceasefire with Hezbollah struck four months ago.

It was not immediately clear what was behind the sounds. Israel's military had on Friday carried out the first strikes on Beirut's southern suburbs since a shaky ceasefire in November ended a year-long war between Israel and Lebanese Hezbollah.

An Israeli airstrike in Beirut killed a member of Hezbollah and Iran’s Quds Force on Tuesday, security officials said, raising fears that the cease-fire in Lebanon may fall through.