Tension is high in the country following last month’s devastating explosion at Beirut’s port that killed nearly 200 people.
The Lebanese army said the fire is at a warehouse that stores oil and tires.
Mustapha Adib was named before French President Emmanuel Macron arrived in Beirut to push for reforms as the country faces several threats to its stability.
The FBI will assist with an investigation into the massive blast in Beirut that killed more than 170 people.
The explosion has fueled popular outrage against the country's top political leaders and security agencies, and led to the resignation of the government on Monday.
Anti-government protests erupted in Beirut after a warehouse explosion killed at least 160 people and injured thousands.
Father Rabih Thoumy can be seen fleeing for cover as a massive explosion shook Saint Maron-Baouchrieh church during a livestreamed service.
Protests against the country's ruling elite have erupted in Beirut following the massive blast in a Beirut Port warehouse.
Activists in Lebanon blame politicians' corruption and negligence for the blast that killed nearly 160 and left thousands injured.
An explosion in Beirut, a full moon in Greece and a masked kiss round out this week's best images.