Lebanon explosion rocks capital city Beirut

 

What you need to know

• At least 100 people were killed and 4,000 wounded in a massive explosion that shook Beirut on Tuesday, state-run media reported, citing the Red Cross. 
• It's still unclear what exactly caused the explosion. Lebanon's Prime Minister said an investigation would focus on an estimated 2,750 metric tons of the explosive ammonium nitrate, stored at a warehouse.
• Beirut's governor said the blast caused up to $5 billion worth of damage.
• A CNN senior international correspondent said the blast felt like an earthquake, while one witness said she had never felt an explosion like it in the city.