The rider was injured and taken to the city’s Shifa hospital.
The Israeli military said that its air force carried out an attack in the northern part of the strip, where Gaza City is located, but it did not give the precise location.
The air force “targeted a terrorist squad ... during final preparations to fire a rocket at Israel,” it said in a statement. “A hit was confirmed.”
Earlier in the day, Palestinian medics said, an Israeli drone killed a Palestinian man, Khaled al-Burai, 25, east of Jabaliya, in northern Gaza.
Witnesses said Israeli aircraft carried out at least four other strikes elsewhere in Gaza on Saturday. One targeted militants traveling in a car in the Zeitoun neighborhood east of Gaza City after they had fired rockets into Israel, they said.
Raids also struck the Beit Lahiya area in the north and the Nusseirat and Al-Bureij refugee camps in central Gaza, without causing casualties, witnesses said.