A man rides a bicycle past the city hall lit up in the colors of the Lebanese national flag in solidarity in the coastal city of Tel Aviv, Israel on Wednesday, a day after a devastating blast at the port of Lebanese capital. Photo: AFP

Lebanese rescue teams pulled out bodies and hunted for missing people on Wednesday from the wreckage caused by a massive warehouse explosion that sent a devastating blast wave across Beirut, killing at least 135.

Prime Minister Hassan Diab declared three days of mourning from Thursday as early investigations blamed negligence for the explosion at Beirut port, which has left tens of people missing and injured more than 5,000 others.

Up to a quarter of a million people were left without homes fit to live in, officials said, after shockwaves smashed building facades, sucked furniture out into streets and shattered windows miles inland.

The death toll was expected to rise from the blast, which officials blamed on a huge stockpile of highly explosive material stored for years in unsafe conditions at the port.

The explosion was the most powerful ever in Beirut, a city still scarred by a civil war that ended three decades ago and reeling from an economic meltdown and a surge in coronavirus infections. The blast rattled buildings on the Mediterranean island of Cyprus, about 100 miles (160 kilometers) away.

"No words can describe the horror that has hit Beirut last night, turning it into a disaster-stricken city," Lebanese President Michel Aoun said in an address to the nation during an emergency cabinet session.

Aoun said 2,750 tons of ammonium nitrate, used in fertilizers and bombs, was stored for six years at the port after it was seized.

The government was "determined to investigate and expose what happened as soon as possible, to hold the responsible and the negligent accountable," he said.

An official source familiar with preliminary investigations blamed the incident on "inaction and negligence," saying "nothing was done" by committees and judges involved in the matter to order the removal of hazardous material.

The cabinet ordered port officials involved in storing or guarding the material to be put under house arrest, ministerial sources told Reuters.

Officials have not confirmed the origin of an initial blaze that sparked the explosion, although a security source and local media said it was started by welding work.

For many, the blast was a dreadful reminder of the 1975-90 civil war that tore the nation apart and destroyed swathes of Beirut, much of which had since been rebuilt.

Ordinary Lebanese, who have lost jobs and watched savings evaporate in the country's financial crisis, blamed politicians who have overseen decades of state corruption and bad governance.

"This explosion seals the collapse of Lebanon. I really blame the ruling class," said Hassan Zaiter, 32, a manager at the heavily damaged Le Gray Hotel in downtown Beirut.

Relatives gathered at a cordon to Beirut port seeking information on those still missing as the search continued. Many of those killed were port and custom employees, people working in the area or those driving nearby during the Tuesday evening rush hour. Some victims were hurled out to sea by the powerful blast.

Reuters