A huge explosion near Lebanon's capital killed at least 10 people, sending shockwaves across the Lebanese capital and shattering glass in people's homes.
The blast caused apartment balconies to collapse, witnesses and security sources said.
The blast occurred in the city's port area, where there were warehouses housing explosives, Lebanon's state news agency NNA and two security sources said.
A third security source said there were chemcials stored in the area.
Footage of the blast shared around by residents on social media showed a column of smoke rising from the port district followed by an enormous blast.
Those who filming what initially appeared to be a big blaze where thrown backwards by the shock.
At least 10 bodies were taken to hospitals, a security source and a medical source told Reuters.
"I saw a fireball and smoke billowing over Beirut. People were screaming and running, bleeding. Balconies were blown off buildings. Glass in high-rise buildings shattered and fell to the street," said a Reuters witness.
Another witness said she saw heavy grey smoke near the port area and then heard an explosion and saw flames of fire and black smoke.
"All the downtown area windows are smashed and there are wounded people walking around. It is total chaos."
UN spokesman Farhan Haq told reporters it was not immediately clear what the cause was, and that there was no indication of any injuries to any UN personnel.
“We do not have information about what has happened precisely, what has caused this, whether it’s accidental ormanmade act,” he said.
The US pentagon said: "We are aware of the explosion and are concerned for the potential loss of life due to such a massive explosion."
According to Reuters, in Cyprus, an island lying west of Lebanon, residents reported two large bangs in quick succession.
One resident of the capital Nicosia said his house shook, rattling shutters.
