Lebanese security troops fired tear gas to disperse dozens of protesters who gathered late on Thursday in anger at Tuesday's blast, which is widely regarded as the most shocking example of the government's incompetence.
The scuffles in central Beirut took place in a ravaged street leading to Parliament with the wreckage from the explosion still littering the whole area.
The protesters sparked a fire, vandalised stores and threw stones at troops, the state-run National News Agency reported.
Police responded with tear gas to disperse the small but furious crowd, wounding some demonstrators, NNA reported.
Tuesday's blast killed at least 145 people, wounded at least 5,000 and destroyed entire districts of the capital.
Lebanese authorities said it was caused by a fire igniting 2,750 tonnes of ammonium nitrate negligently stored in a warehouse at Beirut's port since 2014.
This raised questions as to how such a huge cargo of the highly explosive substance could have been left unsecured for so long.
Lebanon was already mired in its worst economic crisis since the 1975-1990 civil war.
The blast added to the grievances of a protest movement that emerged in October to demand the removal of an inept and corrupt political class.
Activists have called for a large anti-government rally on Saturday for an event they call "Hang them by the gallows".
Meanwhile, Lebanon's ambassador to Jordan resigned on Thursday, saying “total negligence” by the country's authorities showed the need for a change of leadership.
In a statement aired by Lebanese broadcaster MTV, Tracy Chamoun said she could "no longer tolerate" the government's ineptitude.
"I am announcing my resignation as an ambassador in protest against state negligence, theft and lying," Ms Chamoun said.
"This disaster rang a bell. We should not show any of them mercy and they all must go."
She was appointed to her post in 2017 with the endorsement of President Michel Aoun.
It is the second resignation over Tuesday's blast, after former Cabinet minister Marwan Hamadeh stepped down from Parliament on Wednesday.
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Aid is loaded up on a plane to Lebanon at Dubai airport to support Beirut after the explosion, Dubai. Chris Whiteoak / The National -
Aid is loaded up on a plane to Lebanon at Dubai airport to support Beirut after the explosion, Dubai. Chris Whiteoak / The National -
Aid is loaded up on a plane to Lebanon at Dubai airport to support Beirut after the explosion, Dubai. Chris Whiteoak / The National -
Members of the Dutch Urban Search and Rescue (USAR) rescue team before their departure to Lebanon at Eindhoven Air Base in The Netherlands. EPA -
Polish Search and Rescue Firefighters prepare to leave with aid to Beirut, in Warsaw, Poland. EPA -
Members of the Czech search and rescue team board a plane at the Vaclav Havel airport in Prague, Czech Republic. AP Photo -
French Securite Civile (Civil Security) personnel board a Airbus A330, at Roissy airport near Paris, as France is sending search and rescue experts aboard three military planes loaded with a mobile clinic and tonnes of medical equipment to Beirut. AFP -
Palestinians donate blood during an event organized by the municipality, the Red Crescent, and the Ministry of Health in Khan Yunis in the southern Gaza Strip in support of Lebanon. AFP -
French colonel Stanislas Rouqueyrol (L) delivers a speech to personnels of French Securite Civile (Civil Security) in Roissy airport, near Paris. AFP -
French Gendarmes stand as medical and sanitary supplies are loaded aboard a Airbus A330, at Roissy airport, near Paris. AFP -
Medical and sanitary supplies are loaded aboard a Airbus A330 as France is sending search and rescue experts aboard three military planes loaded with a mobile clinic and tonnes of medical equipment to Beirut, Roissy airport, near Paris. EPA -
Crisis management specialists from France's Foreign Affairs ministry board a Airbus A330, at Roissy airport. AFP -
A member of the Czech search and rescue team pets his service dog at the Vaclav Havel airport in Prague, Czech Republic. AP Photo -
Czech Urban Search and Rescue (USAR) personnel prepare for boarding at the Vaclav Havel Airport in Prague, Czech Republic. EPA -
A Russian Emergencies Ministry's truck with humanitarian aid drives into a cargo plane heading to Beirut. REUTERS -
Polish Search and Rescue Firefighters prepare to leave with aid to Beirut, in Warsaw, Poland. EPA -
Members of German Federal Agency for Technical Relief (THW) arrive for their departure to Beirut at international airport in Frankfurt am Main, Germany. EPA -
Members of a Dutch search and rescue team look on before boarding at Eindhoven Air Base. AFP -
People collect donated items in Martyrs Square to help those affected by the prior days devastating explosion in Beirut. Getty Images -
People collect donated items in Martyrs Square to help those affected by the devastating explosion. Getty Images
