The airstrike targeted civilians attending the funeral procession at a graveyard in Sheikh Radwan in northern Gaza City, emergency services spokesman Ashraf al-Qudra said on Thursday.
Israeli airstrikes also killed at least seven Palestinians, four of them children, in the Gaza Strip on Thursday.
One strike targeted a group of people in the northern town of Beit Lahiya, killing a man and a 13-year-old boy, while a second hit Gaza City, killing five people, three of them children, he said. Dozens of civilians were also injured.
The fresh Israeli attacks come as the United Nations Security Council called on Israel and the Palestinians to reach a deal on a long-term truce.
Despite the calls to deescalate the situation, Israel deployed more troops to areas near Gaza.
Israeli Prime Minister Benjamin Netanyahu has also said that Tel Aviv may extend its military offensive against Gaza.
RA/SHI