French President Emmanuel Macron has proposed a new political pact - but says it's up to local government.
Authorities continue to investigate who is to blame.
The unknown substance was stored in the port for six years.
"You think these things don't happen to you."
At least 135 people are dead and thousands are injured.
About 5000 people were injured.
More than 100 people have been killed - could we ever see a similar disaster?
Dozens of people were killed and thousands injured in the explosion.
The President said he had spoken with US Military officials.