On 9 March 2023, a mass shooting occurred at a Kingdom Hall of Jehovah's Witnesses in the Alsterdorf quarter, Hamburg, Germany.

The shooter, identified as Philipp Fusz, entered the building during a service and opened fire, killing six adults and an unborn child, and injuring eight others.

On 9 March 2023, at around 9:00 p.m., a woman sitting in her car outside the Kingdom Hall on Deelbögestrasse was fired upon by a lone gunman wielding a Heckler & Koch P30 semi-automatic handgun.

A specialized armed unit from the Alsterdorf police station that was in the area at the time also arrived and forced entry into the three-story building at 9:09.

[7][8] In 2022, he self-published a book called The Truth About God, Jesus Christ and Satan: A New Reflected View of Epochal Dimensions.

In January 2023, police had received an anonymous letter saying he had "particular anger against religious members or against the Jehovah's Witnesses and his former employer", but after interviewing him on 7 February, found no legal reason to cancel the permit or confiscate the gun.

[13] A funeral service was held on 25 March 2023 and was attended by up to 4,000 members of the faith community, including 50 Hamburg congretioners, relatives and survivors, as well as representatives of the Jehovah's Witness World Headquarters and the Central Europe branch.