In this Oct. 12, 2014, file photo, Palestinians walk during the sunset between the rubble of their destroyed building in Shijaiyah neighborhood of Gaza City in the northern Gaza Strip. (Photo: AP)

JERUSALEM, Jan. 22 (Xinhua) -- Israel's military warned on Tuesday night that it prepares to escalate its attacks if unrest in the Gaza Strip continues.

On Tuesday evening, Israeli military jets carried out several air strikes in the northern Gaza Strip, killing a 24-year-old Hamas militant and injuring four others.

A military spokesperson said in a statement that the attacks were retaliation to several "shooting incidents" along the fence between the besieged Palestinian enclave and Israel.

In one of the incidents, a bullet hit a helmet of an officer "during a riot in the southern Gaza Strip," lightly wounding the officer, according to the army.

"In response, IDF (Israel Defense Forces) troops conducted strikes throughout the day," the spokesperson said.

Late on Tuesday, fighter jets targeted a number of "terror sites" within a Hamas military camp in the northern Gaza Strip, the spokesperson added.

The spokesperson warned that Israel holds Hamas responsible for "all acts of aggression originating from the Gaza Strip."

"The IDF is preparing to operate against all acts of terror emanating from the Gaza Strip and remains determined to protect Israeli civilians," the statement said.

Amid the escalation, Israeli Prime Minister Benjamin Netanyahu decided to cancel a Qatari donation of 15 million U.S. dollars, which were scheduled to be transferred to Hamas on Wednesday to pay salaries of civil servants in Gaza, according to local media reports.

Netanyahu previously said that the transfer of Qatari funds would be carried on only if calm along the fence is kept.