Gaza's Hamas leadership has warned it will escalate fighting with Israel after airstrikes killed several activists at the weekend.
Israel's military admitted that it had carried out a series of air strikes but said that they were in response to a series of rocket attacks.
At least four people were killed in the strikes and over 20 Palestinian fighters and civilians were injured, according to Gaza health official Ashraf Al Kedra, who also said a boy was killed in a playground in Khan Younis.
The Israeli military claimed that it had not attacked that area.
Another Israeli airstrike killed a Gaza militant riding a scooter and witnesses said the force of the explosion caused a wall of a nearby building to collapse, injuring several people.
The Israeli military said they targeted the militant as he was preparing to launch rockets - apparently from his scooter.
Palestinian rocket attacks wounded one person and damaged an empty school.
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