Watch the scene of a large explosion as thick smoke rises from Lebanon's capital Beirut https://twitter.com/i/broadcasts/1DXGyALEjbPGM

At least 10 people are dead after the Beirut explosion, Lebanese security and medical sources say https://reut.rs/3keuKvp 

‘All the downtown area windows are smashed and there are wounded people walking around. It is total chaos’: A @Reuters witness said she saw heavy grey smoke near the port area and then heard an explosion and saw flames of fire and black smoke https://reut.rs/3keuKvp 

JUST IN: Lebanon's internal security chief tells reporters the blast was in a port area with highly explosive material, not explosives

Lebanon's interior minister says initial information indicates highly explosive material seized years ago blew up, though the cause of explosion won't be determined until an investigation is complete https://graphics.reuters.com/LEBANON-SECURITY/BLAST/xklvydjjqpg/chart.png

UPDATE: More than 30 people have been killed and more than 3,000 injured in Beirut blast, Lebanon's health minister says in televised remarks https://reut.rs/39VGQVt 

UPDATE: Death toll in Beirut blast rises to more than 50, Lebanon’s health minister says https://reut.rs/2ES68IT