Brazil's National Museum gutted by fire — it held 20 million items

The details: The cause of the fire is still unknown and it's unclear how many — if any — historical artifacts have been saved, The Guardian reports. There were no reports of injuries, and aerial video show fire spreading throughout the building.

• Brazil's President Michel Temer tweeted: “200 years of work, research and knowledge have been lost. The value of our history cannot be measured by the damage to the building that housed the royal family during the empire. It's a sad day for all Brazilians.”