Protesters clashed with Lebanese security forces at anti-government demonstrations in Beirut on Thursday.
Officers deployed tear gas on dozens of people near parliament.
Demonstrators were angered by Tuesday's devastating blast, which officials say was caused by 2,750 tonnes of ammonium nitrate stored unsafely since 2013.
Many in Lebanon say government negligence led to the explosion, which killed at least 137 people and injured about 5,000 others.
The explosion destroyed entire districts in the capital, with homes and businesses reduced to rubble. Dozens of people are still unaccounted for.
The state news agency says 16 people have been taken into custody as part of an investigation announced by the government this week.
Since the disaster two officials have resigned. MP Marwan Hamadeh stepped down on Wednesday, while Lebanon's ambassador to Jordan Tracy Chamoun stepped down on Thursday, saying the catastrophe showed the need for a change in leadership.
Earlier on Thursday, French President Emmanuel Macron also visited the city and said Lebanon needed to see "profound change" from authorities.
He also called for an international investigation into the disaster.
A city of sirens, empty buildings and empty streets
This port was Lebanon's lifeline to the whole world. Something like 80% of the country's grain came through here. The grain silos, which were built way back when, are teetering. Just beyond there I can see a ship listing heavily. I've lived in Beirut for five years and it's almost unrecognisable - it's a city of sirens, of empty buildings, of empty streets.
As I look at the neighbourhood of Gemmayze just behind the port, I can't see a single pane of glass left. Entire roofs have gone - I can see friends' apartments, which are just open to the sky now. All of this area, which was really heavily populated, has been abandoned. No-one is coming back here any time soon.
What's really noticeable as you walk the streets here is that every second person seems to have a broom in their hand. There are clear-up teams everywhere, but it's pretty low tech: tiny teams of people with pans and brushes to clean up an an entire city's devastation.
The thing that really strikes me is how enormously stupid it was, what criminal negligence it took to leave this highly explosive material right in the very heart of this city, within yards of people, their homes, their businesses. And the authorities here knew - they had been warned that these chemicals were dangerous and that they were a great risk to Beirut and Lebanon.
Where did the ammonium nitrate come from?
In 2013 a Moldovan-flagged ship, the Rhosus, entered Beirut port after suffering technical problems during its journey from Georgia to Mozambique, according to Shiparrested.com, which deals with shipping-related legal cases.
The Rhosus was inspected, banned from sailing onward and was shortly afterwards abandoned by its owners, sparking several legal claims.
Its cargo included the ammonium nitrate, which is used as a fertiliser and as an explosive.
It was stored in a port warehouse for safety reasons, the report said, and it remained there for the next six years.
There are a lot of rules around storing ammonium nitrate, particularly around fire-proofing, because it is so highly explosive if it comes into contact with flames.
The head of the port and the head of the customs authority said that they had written to the judiciary several times asking that the chemical be exported or sold on to ensure port safety.
Port General Manager Hassan Koraytem told OTV they had been aware that the material was dangerous when a court first ordered it stored in the warehouse, "but not to this degree".
Source: BBC
BDST: 1230 HRS, AUG 07, 2020
AP
