"Israeli gunboats fired on fishing boats off the Gaza coast," Nizar Ayyash, head of Gaza's Palestinian Fishermen's Union, told The Anadolu Agency.
No casualties were reported.
Some fishing boats, however, sustained damage in the shooting, Ayyash said.
The Israeli navy routinely shoots at Palestinian fishing boats under the pretext that they go beyond fishing space specified for them, Ayyash said, noting that Israeli attacks usually sabotage the business of Palestinian fishermen.
In late August, Israel allowed Palestinian fishermen to ply their trade up to six nautical miles off the coast of the Gaza Strip – as opposed to three miles previously.
A cease-fire reached between Israel and Palestinian factions on August 26 ended 51 days of relentless Israeli attacks on the Gaza Strip, which killed over 2,160 Palestinians.
According to Ayyash, some 50,000 Gazans earn their living from the fishing business.
He estimated their combined losses during Israel's recent war at more than $6 million.
Ever since Hamas – which Israel deems a "terrorist" organization – won the 2006 legislative polls, Israel has imposed a tight land and sea blockade on the Gaza Strip.
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Ahead of the Helsinki meeting, here is a selection of remarks the two world leaders have made about each other.