An Israeli airstrike in Gaza targeted a man suspected of taking part in the Eilat attack earlier this month, the Israeli military said.
Israel Defense Forces said it targeted 24-year-old Hithem Ziad Ibrahim Masshal in the strike, and that "a direct hit was confirmed."
But Ashraf Al Qudra, spokesman for the Palestinian health minister in Gaza, said the strike killed a 29-year-old hospital security officer riding on a motorbike.
Another person riding on the bike was seriously wounded, medics said.
Prime Minister Benjamin Netanyahu said militant rocket attacks, like the one that prompted the Israeli airstrike, aren't acceptable and won't be tolerated.
"We will act, and are acting, in order to defend Israeli citizens," he said Tuesday.