A strike on the Al-Daraj neighbourhood of Gaza City killed one person and wounded 10 others, including the son of Hamas's chief negotiator Khalil al-Hayya.
The ministry said the activists were affiliated with the Popular Conference for Palestinians Abroad (PCPA), a group Washington has accused of "clandestinely acting on behalf of Hamas".
A Gaza artist who fled war in 2023 said his painting on display showed broken glass, cars topped with mattresses and other belongings and the debris of buildings.