After a rocket was fired from the Palestinian enclave towards Israeli territory, the Israeli air force reportedly conducted overnight airstrikes against Hamas sites in the Gaza Strip.

The Israeli army reported that a rocket was fired from the Gaza Strip towards Israel on Saturday evening, the first such incident in a month.

Islamic Jihad, one of the largest armed factions in Gaza, had threatened retaliation after Israeli forces killed two of its leaders in the West Bank city of Jenin on Thursday.

"In response to the rocket fired at Israeli territory, IDF fighter jets overnight (Sunday) targeted a Hamas terrorist organization weapons factory," the Israeli army said in a statement.

It was stated that the target was a location "where the majority of the organization's rockets in the Gaza Strip are manufactured."

In addition, the IDF reportedly struck "a Hamas terrorist tunnel in the southern Gaza Strip."

A few hours later, the army announced that it had attacked a Hamas military post in response to fire from the Gaza Strip on Israeli warplanes.

Hamas' armed wing stated that anti-aircraft missiles were used during Israeli airstrikes on the Gaza Strip.

Two strikes were reported in the south of the enclave, one against a military training facility in Khan Younis and the other near Rafah in an uninhabited area.

According to Palestinian medical sources, the strikes caused no casualties.

Hamas spokesman Hazem Qassem stated, "The Zionist enemy is extending its aggression against our people by brutally bombarding the Gaza Strip, following its crime yesterday of executing the martyr Ammar Mufleh in Huwara."

The Israeli army's use of lethal force against Palestinian civilians has been criticized internationally as a result of a rise in violence in the occupied West Bank.

On Friday, the 22-year-old Ammar Hadi Mufleh was killed in disputed circumstances in the West Bank town of Huwara, just south of Nablus.

At least 145 Palestinians and 26 Israelis have been killed in violence in Israel and the West Bank, including occupied east Jerusalem, this year. This is the highest death toll since 2015, when at least 148 Palestinians and 24 Israelis were killed.

In Gaza, which has been under Israeli blockade since 2007, at least 49 Palestinians, including combatants and civilians, were killed in three days of fighting between Israel and Palestinian militants in August.