In a televised speech, Sayyed Hassan Nasrallah has called Tuesday's explosion "an exceptional event" that required unity and calm.
The government declares two-week state of emergency in Beirut after the massive blast in the port area of the capital kills at least 135 people with some 5,000 wounded and tens still missing.
Lebanon imports 80 percent of its food supplies and the Port of Beirut was a vital lifeline for the country’s grain imports, storing 85 percent of its cereals.
Despite strict rules regulating the trade of ammonium nitrate, businesses often fail to take necessary precautions.
As angry protesters attack banks across Lebanon, the new government in Beirut and the central bank’s governor remain at odds over tackling the economic crisis.
Prime Minister Hassan Diab accuses rivals of mounting a "coup" against his government as currency crisis deepens.
President Michel Aoun says central bank will begin injecting dollars into market beginning on Monday in hopes to solidify Lebanese pound, following demonstrations against falling currency.
Protesters converge on main square in capital Beirut that was an epicentre for protests last year but which has been mainly quiet over recent months in part due to coronavirus lockdown.
Anti-government protesters gathered outside the country's interior ministry, protesting against the Lebanese speaker's security forces who clashed with them earlier, after they tried to stage a sit-in outside the speaker's residence.
The government approved its recovery plan last week, announcing that it would form the basis of negotiations with the International Monetary Fund for aid.
"Interior Minister Horst Seehofer has banned the Shia terrorist organisation Hezbollah in Germany," a ministry spokesman says, as country raids several places to detain suspected members of group.
The policy of relying too much on debt to fund the budget has created problems for the young government of Prime Minister Hassan Diab.
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