Beirut blast conspiracy theories flood social media
In the absence of clear-cut answers and pending the results of an official investigation, some postings have served to feed disinformation.
A video showing a missile in the sky was quickly touted as proof of an attack by Lebanon's former wartime enemy and neighbour Israel.
But verification by AFP shows the missile image was digitally pasted into the video, after several earlier postings of the same footage which showed no such projectile.
A separate posting of a rocket crashing into another site in Beirut port is marked as "filmed by thermal camera".
But a filter was found to have been added to the footage and a missile inserted.
To back up the finger-pointing at Israel, with which Lebanon technically remains at war, online videos allegedly show a drone dropping an unidentified object over the port, seconds before the blast.
It has been authenticated but with no connection to August 4, and linked in fact to Israeli drones over south Lebanon days earlier, according to several local media.
A photograph of Israeli Prime Minister Benjamin Netanyahu holding a map of Beirut to indicate the port has been added to the mix.
But the picture dates back to September 2018 and shows Netanyahu at the UN General Assembly condemning alleged "secret sites" of the Lebanese Shia movement Hezbollah.
He was pointing at a zone near Beirut international airport, several kilometres (miles) away from the port.
The Beirut blast created a crater 43 metres (140 feet) deep, according to a Lebanese security source, citing an assessment by French experts in pyrotechnics.
But doctored photographs have cropped up on social media among the abundance of shots of actual widespread destruction across Beirut.
One shows rows of totally burnt-out "imported cars" - an image in fact taken in eastern China's Hebei province after a 2015 blast at a chemical warehouse.
The crater it left behind is falsely identified as the scene at Beirut port.
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Among other rigged photos suggesting international solidarity with Beirut have been fake images of Cairo pyramids and Tunis clock tower lit up in the colours of the Lebanese flag.
Lebanon's Prime Minister Hassan Diab on Monday handed in the resignation of his government following angry street demonstrations over official corruption and negligence blamed for the catastrophe.
Agencies contributed to this report.