The Israeli military says it has struck militant targets in Gaza, including a weapons manufacturing site, after six rockets were fired from the territory.
There were no immediate reports of casualties or major damage on either side after the exchange of fire early on Friday.
Israel and Hamas have traded fire on a number of occasions in recent weeks, and Hamas has launched a wave of incendiary balloons across the frontier that have torched wide swathes of farmland.
Hamas is pressing Israel to ease its blockade on Gaza and allow large-scale development projects. Egypt and Qatar are trying to shore up an informal cease-fire.
Those efforts have grown more urgent in recent days as authorities in Gaza have detected the first cases of local transmission of the coronavirus.
Hamas has imposed a lockdown in the coastal territory bordering Israel and Egypt, which is home to 2 million Palestinians.
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