"I see the emotion on your face, the sadness, the pain. This is why I'm here," he told one group, shaking their hands on roads strewn with rubble and flanked by shops with windows blown out after Tuesday's blast that killed 145 and injured 5000.

Macron, wearing a black tie in mourning and flanked by security guards, promised to send more medical and other aid to Lebanon, while those around him chanted "Revolution" and "The people want the fall of the regime."

"But what is also needed here is political change. This explosion should be the start of a new era," Macron said, making the tour shortly after arriving on the first visit to Lebanon by a foreign leader since the blast.

The president has said he would deliver "home truths" to a government that France and other Western donors have said must reform the country's politics and the economy.

One man told Macron: "We hope this aid will go to the Lebanese people not the corrupt leaders."

Before the Beirut port blast Lebanon was grappling with an imploding economy - its banks in crisis, currency in freefall and mountain of debts climbing.

"Mr President, you're on General Gouraud Street, he freed us from the Ottomans. Free us from the current authorities," said one person among the crowd who gathered around him, appealing for help from Lebanon's former colonial power.

Some of the crowd, who were filmed in a predominantly Christian district of the capital, shouted: "Mr Macron, free us from Hezbollah," referring to the Iran-backed Shi'ite Muslim group, a powerful player in a nation where political loyalties often run along sectarian lines.

After visiting a pharmacy damaged by the explosion, Macron told the crowd: "I understand your anger. I am not here to write a blank cheque ... to the regime."

Australian Associated Press