Israeli attack helicopters on Monday struck Hamas military positions in Gaza, officials said, after the country's army reported a balloon-borne "explosive device" from the Palestinian enclave targeted its territory.
Monday's raid, which resulted in damage to the Hamas positions but no casualties, was the third tit-for-tat exchange in as many days.
A Palestinian official said three military observation posts were hit in the south and centre of the Hamas-ruled coastal strip.
The Israeli military earlier said its air force struck "two Hamas military posts" in response to the latest launch of a balloon-borne device from Gaza.
"A cluster of balloons carrying an explosive device was launched from the southern Gaza Strip towards Israeli territory," an army statement said.
"No injuries or damage were reported."
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