By Bassem Mroue and Zeina Karam

Updated 11:30 am ET

Investigators began searching the wreckage of Beirut's port Wednesday for clues to the cause of the massive explosion that ripped across the Lebanese capital as the government ordered port officials put under house arrest.

International aid flights began to arrive, as Lebanon's leaders struggled to deal with the aftermath of Tuesday's blast, crippled by an economic crisis and facing a public where many already blame chronic mismanagement and corruption among the ruling elite for the disaster.

The explosion at the port killed at least 100 people and wounded thousands. Hospitals were overwhelmed — one that was damaged in the blast had to evacuate all its patients to a nearby field for treatment. Buildings were damaged for miles around the city, and Beirut's governor said Wednesday that hundreds of thousands might not be able to return to their homes for two or three months.

Meanwhile, an official letter surfaced online showing that the head of the customs department had warned repeatedly over the years that a huge stockpile of ammonium nitrate stored in a hangar in the port was a danger and asked for a way to remove it.

Ammonium nitrate is a component of fertilizer that is potentially explosive. The 2,750-ton cargo had been stored at the port since it was confiscated from a ship in 2013, and on Tuesday it is believed to have detonated after a fire broke out nearby.

The resulting explosion — hitting with the force of a 3.5-magnitude earthquake — was the biggest ever seen in Beirut, a city blasted by a 1975-1990 civil war, bombarded in conflicts with Israel and hit by periodic terror attacks.

The 2017 letter from the custom's chief to a judge could not be immediately confirmed. If authentic, it could deepen the belief already expressed by some Lebanese that widespread mismanagement, negligence, and corruption among the country's ruling class is to blame for the explosion.

President Michael Aoun vowed before a Cabinet meeting on Wednesday that the investigation would be transparent and that those responsible will be punished.

"There are no words to describe the catastrophe that hit Beirut last night," he said.

After the meeting, the Cabinet ordered an unspecified number of Beirut port officials put under house arrest pending an investigation into how the ammonium nitrate came to be stored at the port for years. The government also declared a two-week state of emergency, effectively giving the military full powers during this time.

State prosecutor Ghassan Oueidat ordered security agencies to start an immediate investigation and collect all reports and letters related to the materials stored at the port as well as lists of people in charge of maintenance, storage, and protection of the hangar.

In the letter, the customs chief warns of the "dangers if the materials remain where they are regarding the safety of (port) employees" and asked the judge for guidance on what to do with it. He said five similar letters were sent in 2014, 2015, and 2016. The letter proposes the material be exported or sold to a Lebanese explosives company. It is not known if there was ever a response.

The government also said public schools will be opened to host those who lost their homes and the minister of tourism will also work on opening some hotels for use by those who lost their homes. It also promised compensation for the victims.

With the Port of Beirut destroyed, the government said imports and exports will be secured through other ports in the country, mostly in the northern city of Tripoli and the southern port city of Tyre.

Residents of Beirut confronted a scene of utter devastation Wednesday. Smoke still rose from the port, where a towering building of silos was half destroyed, spilling out grain. Hangars around it were completely toppled. The blast knocked out a crater some 200 meters (yards) across that filled with seawater — it was as if the sea had taken a bite out of the port, swallowing buildings with it.

Much of downtown was littered with damaged vehicles and debris that had rained down from the shattered facades of buildings.

Lebanon was already on the brink of collapse amid a severe economic crisis. Many have lost their jobs and seen their savings evaporate because of a currency crisis. Food security is a worry since Lebanon imports nearly all its vital goods and its main port is devastated. The government is strapped for cash.

Lebanon's economic crisis is rooted in decades of systemic corruption by political factions that exploit public institutions for the benefit of their supporters. Decades after the civil war, residents endure frequent power outages and poor public services.

French President Emmanuel Macron was to traveling to Beirut on Thursday to offer support and meet with Lebanese leaders. Lebanon is a former French protectorate and the countries retain close political and economic ties.

___

Associated Press writers Sarah El Deeb and Hassan Ammar in Beirut, Jon Gambrell in Dubai, United Arab Emirates, and Joseph Krauss in Jerusalem contributed to this report.

Share:
More In Culture
The Future of Pokémon GO
In its year-and-a-half on the market, Pokémon GO is changing the way gamers interact with technology. The game's global marketing lead Archit Bhargava joins us to discuss the app's unprecedented success in bringing augmented reality into the mainstream.
Andrea Bocelli Talks Music and the Mission to Empower
World-famous Italian tenor Andrea Bocelli talks about his foundation's SMS campaign that launches this month. The initiative allows any U.S. mobile user to text a $10 donation that benefits the organization's education initiatives in Haiti.
Tiny House, Big Savings
In today's edition of "House Rules" brought to you by Chase Home Lending, Jenna Spesard, founder of "Tiny House Giant Journey", joins to talk about quitting her job and building a tiny house. She's been living and traveling in her tiny home since 2014.
Remixing Media with Vix
Rafael Urbina Quintero, CEO and Chairman of Vix, discusses the company's global audience, which focuses on Hispanic and Latin American communities across the world.
Why It's Hard to Get Those ZZZ's
Can you remember the last time you had a good night's sleep? Many people go weeks without sleeping through the entire night. Marina Khidekel, Senior Deputy Editor at Women's Health, joins Cheddar to talk about its latest sleep study in partnership with Thrive Global and the American Sleep Association.
Closing Bell: December 8, 2017
We are bringing you a special 30 minute show dedicated to the crypto craze with a round table discussion on Bitcoin's wild week.
How One Entrepreneur Changed His Life with Soap Operas
Entrepreneur Ramon Van Meer changed his life 2.5 years ago when he ditched his travel agency to develop fan pages for various interest. Now, Soap Hub is his main business, and the fan page brings in about $2.5 million per year.
FoodieTrip Wants You to Eat Like A Local Anywhere
FoodieTrip wants you to eat like a local, no matter where you are in the world. The New York based start-up is the first peer-to-peer marketplace that connects travelers with local food guides all around the globe.
Impact of Sexual Misconduct on Politics, Hollywood, and Corporate America
Valeisha Butterfield Jones is the CEO of Women In Entertainment Empowerment Network, a former Obama Administration official, and a former Google executive. Jones gives her perspective on the moment of reckoning that Hollywood, media, and politics are experiencing amidst sexual misconduct allegations.
Load More