The European X-ray free-electron laser is inaugurated in Hamburg, Germany.
- A double-decker sightseeing bus collides with a car in Hamburg, Germany, leaving eleven injured.
- Leaders from the Group of Twenty come together at the G20 summit in Hamburg, Germany, including United States President Donald Trump who is set to meet with President of Russia Vladimir Putin.
- German police storm a refugee center in Hamburg after a knife-wielding man barricades himself in a room with a pregnant woman believed to be his partner. The man was injured before he was arrested.
- Voters in the German city state of Hamburg go to the polls with the governing Social Democratic Party of Germany led by Olaf Scholz retaining power.
- In Germany, a Hamburg court fines Google EUR145,000 for violating privacy laws with its Street View service.