BREAKING: A large explosion struck Beirut, Lebanon, shattering windows. The cause is unknown but security forces say it happened in a port warehouse area.

Several people are reported wounded, casualties are unknown.

A massive explosion in Beirut& #39;s port area caused a "very high number of injuries," says Lebanon& #39;s health minister.

What we know:
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> Shattered high-rise windows, collapsed balconies; Hamra shopfronts destroyed
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> Unconfirmed reports of a 2nd blast
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> Casualties are unknown

UPDATE: At least 10 people were killed by an explosion in Beirut, security officials told @Reuters.

https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> The cause and total casualties are unknown
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> "Dozens" wounded, say officials
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> Witnesses report people hit by flying glass, debris
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> Explosion heard 150 miles away in Cyprus

Hundreds of people are being treated for injuries after a massive explosion in Beirut, says Lebanon& #39;s Red Cross.

Many others are trapped in the blast area, it says.

https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> Exact casualties, injuries unknown
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> At least 10 people died, reports @Reuters
https://abs.twimg.com/emoji/v2/... draggable="false" alt="▪️" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> The cause is still unknown

Senior security officials say the explosion in Beirut may be linked to "highly explosive" confiscated materials being stored in a warehouse.

The PM declared Wednesday a day of mourning, and hospitals are seeking blood donations.

At least 10 people are reported dead.

UPDATE: The explosion in #Beirut killed at least 25 people and wounded over 2,500, says Lebanon& #39;s health minister.

Officials say all hospitals there are full.

Casualties and injuries are expected to rise, with many believed buried under the rubble.

The #Beirut explosion littered streets with broken glass and debris. Witnesses near the port say devastation is worse than the civil war:

"I& #39;ve experienced everything, but nothing like this."

Hospitals are full, some struggling to keep power on amid Lebanon& #39;s economic crisis.

UPDATE: Lebanon& #39;s health ministry says the death toll from the #Beirut explosion has risen to at least 50.

Over 2,750 other people are injured. Victims are still being located and taken away from the blast site. A soldier at the port said: "It& #39;s a catastrophe inside."

Several hospitals in #Beirut were damaged by the explosion. Some are asking for generators to keep power on as they evacuate patients.

"This is a catastrophe," said a doctor.

Lebanon is already dealing with a major economic crisis and power cuts; the govt is appealing for aid.