Lebanon's Prime Minister Hassan Diab said that those responsible for an explosion at a "dangerous" warehouse in Beirut port area that rocked the capital would pay the price.
"I promise you that this catastrophe will not pass without accountability. ... Those responsible will pay the price," he said in a televised speech.
"Facts about this dangerous warehouse that has been there since 2014 will be announced and I will not preempt the investigations".
Two massive explosions in Beirut killed at least 50 people, wounded more than 2,700 and caused extensive damage across the Lebanese capital on Tuesdsay.
Lebanon’s health minister Hamad Hasan said the explosion caused a “very high number of injuries.”
President Michel Aoun called for an emergency meeting of the country's Supreme Defence Council.
For his part, Diab declared a day of mourning for Wednesday.
Diab also pleaded with the international community for assistance after the "catastrophe."
Meanwhile, several nations expressed solidarity with the Lebanese people during the current crisis.
British Prime Minister Boris Johnson said Britain stood ready to provide any support it could to help Beirut.
"The pictures and videos from Beirut tonight are shocking," Johnson wrote on Twitter.
"The UK is ready to provide support in any way we can, including to those British nationals affected."
For his part, French Foreign Minister Jean-Yves Le Drian said his country is ready to help Lebanon following the huge explosion in Beirut.
"France is always on the side of Lebanon and the Lebanese people. It is ready to offer assistance depending on the needs expressed by Lebanese authorities."