BEIRUT (Reuters, Ruptly) — A large explosion rocked Beirut on Tuesday, injuring many people as glass shattered and balconies collapsed from the impact, Reuters witnesses said.

Lebanon’s state news agency NNA and two security sources said the blast had occurred in the port area where there are warehouses housing explosives. It was not immediately clear what caused the blast or what kind of explosives were in the warehouses.

Local broadcaster LBC quoted the health minister as saying there was a “very high number” of injures and a large amount of damage. Al Mayadeen television said hundreds were wounded.