Israel alleged Hamas launched an attack against troops in Israeli-controlled territory in Gaza.

The new rounds of violence were “likely the most serious challenge to the tenuous ceasefire deal in Gaza since it came into force,” The Associated Press said. The Israeli Defense Forces said the ceasefire was back in effect after its heavy airstrikes,

Residents in Gaza City said they heard an explosion in the area of Beit Lahia and saw a column of smoke on Wednesday. The latest attack comes 24 hours after Israeli prime minister Benjamin Netanyahu launched a new wave of strikes on the enclave, which Gaza health authorities say killed more than 100 people.

Israeli Prime Minister Benjamin Netanyahu announced on Tuesday that he had ordered "powerful strikes in the Gaza Strip immediately." The big picture: The deal to end the war in Gaza was easily President Trump's biggest diplomatic achievement this term.

Prime Minister Benjamin Netanyahu has ordered the Israeli military to immediately carry out "powerful strikes" in the Gaza strip, hours after Israeli officials said the remains of a hostage returned by Hamas were body parts of another hostage Israel recovered in Gaza nearly two years ago.

Israel’s military said the ceasefire in Gaza was back on Wednesday after it carried out heavy air strikes that killed 104 people.

An official of the Israel Defense Forces told NBC News that Israeli Prime Minister Benjamin Netanyahu called for strikes in retaliation for a Hamas attack in Rafah.

The order from Netanyahu follows heightened tensions after Hamas returned a set of remains that Israel said belonged to a hostage recovered earlier in the war.

Hamas has said the return of the remaining bodies "may take some time" due to the destruction wrought in Gaza. Israeli Prime Minister Benjamin Netanyahu on Tuesday instructed the country's military to "carry out powerful strikes in Gaza," a statement from his office said, in response to alleged ceasefire violations by Hamas.

Israeli Prime Minister Benjamin Netanyahu ordered the Israeli military to carry out “forceful” strikes in the Gaza Strip on Tuesday, threatening the already fragile ceasefire between Israel and the Palestinian militant group Hamas.