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.

No injuries occurred from the strikes late Saturday east of Al-Bureij in the central Gaza Strip and east of Rafah in the south of the blockaded enclave run by Islamist movement Hamas, according to a Hamas security source.

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.

“No injuries 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.

Israel and Hamas have fought three wars since 2008.