Israeli aircraft have struck two Hamas observation points in the Gaza Strip, a security source said Sunday, after the army reported balloons carrying an "explosive device" were sent toward Israel.

The strikes occurred after a "cluster of balloons carrying an explosive device was launched from the Gaza Strip towards Israeli territory," the Israeli army said in a statement.

"or damage were reported," it said.

Late Wednesday, Israeli aircraft targeted several militant sites in Gaza after an "explosive balloon" launched from the Palestinian enclave damaged a house in Israel.

Palestinians in Gaza have for months been sporadically launching balloons with incendiary and explosive devices at southern Israel in parallel with weekly protests and clashes taking place at the fence.

At least 251 Palestinians have been killed by Israeli fire since March 2018, the majority shot during weekly border protests and others hit by tank fire or air strikes in response to violence from Gaza.

Two Israeli soldiers have been killed over the same period. Israel and Hamas have fought three wars since 2008.

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