Thousands of Lebanese prepared Saturday for a major protest against a political leadership they blame for a monster explosion that killed more than 150 people and disfigured the capital Beirut.

Two days after a landmark visit by French President Emmanuel Macron, diplomatic activity intensified in Beirut to organise international support for the disaster-hit country ahead of a Sunday aid conference.

For the fourth day running, Beirut woke up to the sound of broken glass being swept on the streets, its inhabitants still taking stock after one of the biggest blasts of its kind in recent history.

A fire at Beirut port on Tuesday ignited a stock of ammonium nitrate and triggered an explosion that was felt in neighbouring countries and destroyed entire neighbourhoods of the city.

Spectacular videos of the disaster show a mushroom-shaped shockwave that drew comparisons with the 1945 atomic bombs on Japan while foreign rescue teams compared the devastation with earthquake scenes.

Saturday could be the last day anybody buried under rubble has any chance of being found alive and according to the health ministry, more than 60 people are still missing.